Lexicon DJ Equipment MPX 550 User Manual
Download from Www.Somanuals.com. All Manuals Search And Download.  
COMMUNICATIONS NOTICE  
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These  
limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and  
can radiate radio frequency energy and, if not installed and used in accordance with manufacturer’s instructions, may cause harmful interference  
to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause  
harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try  
to correct the interference by one or more of the following measures:  
•
•
•
•
Reorient the receiving antenna.  
Relocate the computer with respect to the receiver.  
Move the computer away from the receiver.  
Plug the computer into a different outlet so that the computer and receiver are on different branch circuits.  
If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may find the  
following booklet prepared by the Federal Communications Commission helpful: "How to identify and Resolve Radio/TV Interference Problems."  
This booklet is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No. 004-000-00345-4.  
A Harman International Company  
Lexicon, Inc.  
3 Oak Park  
Bedford, MA 01730-1441 USA  
Tel 781-280-0300  
Fax 781-280-0490  
www.lexicon.com  
Customer Support  
Tel 781-280-0300  
Fax 781-280-0495 (Sales)  
Fax 781-280-0499 (Service)  
© 2002 Lexicon, Inc. All rights reserved.  
This document should not be construed as a commitment on the part of Lexicon, Inc. The information it contains is subject to change  
without notice. Lexicon, Inc. assumes no responsibility for errors that may appear within this document.  
Lexicon Part No. 070-14912 | Rev 1 | 02/02  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
Lexicon  
Introduction  
Section 1: Getting Started  
About the MPX 550. . . . . . . . . . . . . . . . . . . . . . . . 1-2  
Highlights  
Important Safety Instructions. . . . . . . . . . . . . . . iv  
US  
DE  
ES  
FR  
IT  
Front Panel Overview. . . . . . . . . . . . . . . . . . . . . . . 1-4  
Wichtige Sicherheitshinweise. . . . . . . . . . . . . . . iv  
Instrucciones de seguridad importantes . . . . . . . v  
Instructions importantes relatives à la sécurité. . . v  
Importanti norme di sicurezza . . . . . . . . . . . . . . vi  
Instruções Importantes de Segurança. . . . . . . . . vi  
Vigtig Information om Sikkerhed . . . . . . . . . . . .vii  
Tärkeitä Turvallisuusohjeita . . . . . . . . . . . . . . . .vii  
Viktig Informasjon om Sikkerhet . . . . . . . . . . . .viii  
Viktiga Säkerhetsföreskrifter . . . . . . . . . . . . . . .viii  
Front Panel Display  
Rear Panel Overview . . . . . . . . . . . . . . . . . . . . . . . 1-8  
Connecting the Unit . . . . . . . . . . . . . . . . . . . . . . 1-10  
Footswitch • Typical Connections to a Console  
PT  
DK  
FI  
Setting Audio Levels. . . . . . . . . . . . . . . . . . . . . . . 1-12  
Input • Output  
Section 2: Basic Operation  
NO  
Selecting and Loading Programs. . . . . . . . . . . . . . . 2-2  
Editing Programs . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3  
The "Adjust" Parameter. . . . . . . . . . . . . . . . . . . . . . 2-3  
Storing Programs. . . . . . . . . . . . . . . . . . . . . . . . . . 2-4  
The Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5  
SE  
Important User Information. . . . . . . . . . . . . . . . ix  
Wichtige Benutzerinformation . . . . . . . . . . . . . . x  
Información importante para el usuario . . . . . . . xi  
Important - Informations Utilisateur . . . . . . . . . xii  
Importanti informazioni per l’utente. . . . . . . . . xiii  
Informações Importantes ao usuário. . . . . . . . . xiv  
US  
DE  
ES  
FR  
IT  
Tap Tempo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6  
Matching Rhythm • Audio Tap • Global Tempo  
Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7  
PT  
ii  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
MPX 550  
Section 3: System Mode  
Section 6: MIDI Operation  
System Mode Functions . . . . . . . . . . . . . . . . . . . . . 3-2  
Learn Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2  
MIDI Channel Assignment . . . . . . . . . . . . . . . . . . . 6-2  
Parameters • MIDI Dumps • Restore Default Commands  
Program Change Messages . . . . . . . . . . . . . . . . . . 6-3  
Section 4: Program Descriptions  
Loading Programs • Activating Bypass or Tap Functions  
Single Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2  
Plate • Gate/Inv • Hall • Chamber • Ambience • Room •  
Tremolo • Rotary • Chorus • Flange • Detune • Pitch • Dly/Eko  
Continuous Controllers. . . . . . . . . . . . . . . . . . . . . . 6-4  
MIDI Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6  
MIDI Dumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6  
Sysex Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7  
MIDI Implementation Chart . . . . . . . . . . . . . . . . . . 6-8  
Special FX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16  
Stereo Stage  
Dual Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18  
Efx Bal • Flng-Dly • Pch-Dly • Chor-Dly • Dly-Rvb • Flng-Rvb •  
Pch-Rvb • Chor-Rvb • MSplit Dly • MSplit Rvb • Dual Mono  
Appendix  
Cmprssr. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31  
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2  
Declaration of Conformity . . . . . . . . . . . . . . . . . . . A-3  
Dynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32  
Peak Expansion • Compression • Tape Saturation • Level Meters •  
Typical Mastering Dynamics Control Adjustments  
Live-FOH (Front of House) . . . . . . . . . . . . . . . . . . 4-36  
Index  
Section 5: Parameter Descriptions  
Parameter Graphics . . . . . . . . . . . . . . . . . . . . . . . . 5-2  
Parameter Glossary . . . . . . . . . . . . . . . . . . . . . . . . 5-4  
iii  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
Lexicon  
ENGLISH  
IMPORTANT SAFETY INSTRUCTIONS  
DEUTSCH  
WICHTIGE SICHERHEITSHINWEISE  
US  
US  
DE  
DE  
Save these instructions for later use.  
Heben Sie sich diese Sicherheitsanweisungen auch für später auf.  
•
Follow all instructions and adhere to warnings marked on the unit and in the operating  
instructions.  
•
•
Befolgen Sie alle auf der Vorrichtung stehenden Anweisungen und Warnungen.  
Immer nur mit der richtigen Spannung verwenden! Die Gebrauchsanweisungen des  
Herstellers informieren Sie über die elektrischen Anforderungen. Vergessen Sie nicht  
daß bei verschiedenen Betriebsspannungen ggf. auch verschiedene Leitungskabel  
und/oder Verbindungsstecker zu verwenden sind.  
•
Always use with the correct line voltage. Refer to the manufacturer’s operating  
instructions for power requirements. Be advised that different operating voltages may  
require the use of a different line cord and/or attachment plug.  
•
•
Do not install the unit in an unventilated rack, or directly above heat producing  
equipment such as power amplifiers. Observe the maximum ambient operating  
temperature listed in the product specification.  
•
•
Stellen Sie die Vorrichtung nicht in ein unbelüftetes Gestell oder unmittelbar über  
wärmeerzeugende Geräte wie z.B. Tonverstärker. Halten Sie die in den  
Produktspezifikationen angegebene maximale Umgebungstemperatur bei Betrieb ein.  
Slots and openings on the case are provided for ventilation - to ensure reliable  
operation and prevent the unit from overheating. Do not block, cover, or insert objects  
into the openings. Never spill a liquid of any kind on the unit.  
Schlitze und Öffnungen im Gehäuse dienen der Belüfung; um verläßlichen Betrieb  
sicherzustellen und Überheizen zu vermeiden dürfen diese Öffnungen nich verstopft  
oder abgedeckt werden. Stecken Sie nie irgend einen Gegenstand durch die  
Belüftungsschlitze. Vergießen Sie keine Flüssigkeiten auf den Apparat.  
•
•
Never attach audio power amplifier outputs directly to any of the unit’s connectors.  
•
Dieses Produkt is mit einem 3-drahtigen Erdungsstecker ausgerüstet. Diese  
Sicherheitsmaßnahme darf nicht unwirksam gemacht werden.  
To prevent shock or fire hazard, do not expose the unit to rain or moisture, or operate  
it where it will be exposed to water.  
•
•
Schließen Sie nie Tonverstärker unmittelbar an einen Anschluß des Apparates an.  
•
•
Do not attempt to operate the unit if it has been dropped, damaged, exposed to  
liquids, or if it exhibits a distinct change in performance indicating the need for  
service.  
Um elektrischen Schlag oder Feuer zu vermeiden, setzen Sie den Apparat weder Regen  
noch Feuchtigkeit aus und betreiben Sie ihn nicht dort wo Wasser eindringen könnte.  
Take precautions not to defeat the grounding or polarization of the unit’s power cord.  
•
•
Versuchen Sie nicht den Apparat zu betreiben falls er fallen gelassen, beschädigt, oder  
Flüssigkeiten ausgesetzt wurde, oder falls sich seine Arbeitsweise derart ändert daß  
daraus ein Bedarf nach Raparatur zu schließen ist.  
This triangle, which appears on your component, alerts you to the presence  
of uninsulated, dangerous voltage inside the enclosure - voltage that may be  
sufficient to constitute a risk of shock.  
Dieser Apparat sollte nur von qualifizierten Fachleuten geöffnet werden. Das  
Abnehmen von Abdeckungen setzt Sie gefährlichen Spannungen aus.  
ü Dieses Dreieck, welches auf Ihrem Bauteil angebracht ist, warnt Sie vor dem  
Vorhandensein nicht isolierter gefährlicher Spannung im Gerät. Diese  
Spannung kann so hoch sein, dass das Risiko eines Stromschlags besteht.  
This triangle, which appears on your component, alerts you to important  
operating and maintenance instructions in this accompanying literature.  
ü Dieses Dreieck, welches auf Ihrem Bauteil angebracht ist, macht Sie auf  
wichtige Betriebs- und Wartungshinweise in diesen Hinweisen aufmerksam.  
iv  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
MPX 550  
ESPAÑOL  
INSTRUCCIONES DE SEGURIDAD  
IMPORTANTES  
FRANÇAIS  
INSTRUCTIONS RELATIVES À LA SÉCURITÉ  
ES  
ES  
FR  
FR  
Gardez ces instructions pour réference future.  
•
•
Observez toutes les instructions et tous les avertissements marqués sur l’appareil.  
Guarde esta instrucciones para uso posterior.  
Branchez uniquements sur un réseau de tension indiquée. Consultez le manuel  
d’instruction du fabriquant pour les spécifications de courant. N’oubliez pas que  
différentes tensions peuvent nécessiter l’utilisation de cables et/ou de fiches de  
connexion différents.  
•
Utilice siempre el voltaje correcto. Diríjase  
a
las instrucciones de operación del  
fabricante para obtener las especificaciones de potencia. Esté al tanto de que voltajes  
de operación distintos requieren el uso de cables y/o enchufes distintos.  
•
No instale esta unidad en un estante sin ventilación, ni tampoco directamente encima  
de equipos que generen calor tales como amplificadores de potencia. Fíjese en las  
temperaturas ambientales máximas de operación que se mencionan en las  
especificaciones del producto.  
•
•
•
N’installez pas l’appareil en un compartiment non-aéré ou directement au-dessus  
d’équipements générateurs de chaleur, tels qu’amplificateurs de courants, etc. Ne  
dépassez pas la température ambiante maximale de fonctionnement indiquée dans les  
spécifications du produit.  
•
Las aperturas y ranuras del chasis sirven para proveer la ventilación necesaria para  
operar la unidad con seguridad y para prevenir sobrecalentamiento, y por lo tanto no  
pueden ser obstruidas o cubiertas. No introduzca objetos de ningún tipo a través de las  
ranuras de ventilación, y nunca deje caer ningún líquido sobre la unidad.  
Des fentes et ouvertures sont prévues dans le boîtier pour l’aération; Pour assurer le bon  
fonctionnement et pour prévenir l’échauffement, ces ouvertures ne doivent pas être  
couvertes ou bloquées. N’insérez pas d’objets dans les fentes d’aération. Empêchez  
tout liquide de se répandre sur l’appareil.  
•
•
•
•
Este producto está equipado con un enchufe de  
tierra. Éste es un elemento de seguridad que no debe ser eliminado.  
3
clavijas con conexión  
a
Ce produit est muni d’une fiche à trois fils pour la mise à terre. Ceci est une mesure de  
sécurité et ne doit pas être contrariée.  
Nunca conecte ningún tipo de salida de amplificadores de sonido directamente a los  
conectores de la unidad.  
•
•
Ne connectez jamais d’amplificateurs audio directement aux connecteurs de l’appareil.  
Pour empêcher les chocs électriques et le danger d’incendie, évitez d’exposer l’appareil  
à la pluie ou à l’humidité, et ne le mettez pas en marche en un endroit où il serait  
exposé aux éclaboussures d’eau.  
Para prevenir descargas eléctricas o incendios, mantenga la unidad alejada de la lluvia,  
humedad o cualquier lugar en el que pueda entrar en contacto con agua.  
No trate de hacer funcionar la unidad si se ha caído, está dañada, ha entrado en  
contacto con líquidos, o si nota cualquier cambio brusco en su funcionamiento que  
indique la necesidad de hacerle un servicio de mantenimiento.  
•
•
N’essayez pas de faire fonctionner l’appareil s’il est tombé à terre, a été endommangé,  
exposé  
à
un liquide, ou si vous observez des différences nettes dans son  
fonctionnement, indiquant la nécessité de réparations.  
•
Esta unidad deberá ser abierta únicamente por personal calificado. Si usted quita las  
coberturas se expondrá a voltajes peligrosos.  
Cet appareil ne doit être ouvert que par un personnel de service qualifié. En enlevant  
les couvercles vous vous exposez à des tensions électriques dangereuses.  
Este triángulo que aparece en su componente le advierte sobre la existencia  
dentro del chasis de voltajes peligrosos sin aislantes - voltajes que son lo  
suficientemente grandes como para causar electrocución.  
Ce triangle, sur votre appareil vous avertit de la présence de tension  
dangereuse, non-isolée à l’intérieur du boîtier - une tension suffisante pour  
représenter un danger d’électrocution.  
Este triángulo que aparece en su componente lo alerta sobre las instrucciones  
de operación y mantenimiento importantes que están en los materiales de  
lectura que se incluyen.  
Ce triangle sur sur votre appareil vous invite de suivre d’importantes  
instructions d’utilisation et d’entretien dans la documentation livrée avec le  
produit.  
v
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
Lexicon  
ITALIANO  
IMPORTANTI NORME DI SICUREZZA  
PORTUGUESE  
INSTRUÇÕES DE SEGURANÇA IMPORTANTES  
IT  
IT  
PT  
PT  
Conservare le presenti norme per l’utilizzo futuro.  
Economize estas instruções para uso posterior.  
•
•
Osservare tutte le istruzioni e le avvertenze apposte sull’unità.  
•
•
Siga todas as instruções e advertências marcadas na unidade.  
Utilizzare esclusivamente con la tensione di rete corretta. Consultare le istruzioni  
operative fornite dal fabbricante per i dati riguardanti la tensione e l’assorbimento di  
corrente. Potrebbe essere necessario l’uso di cavi di rete e/o di spine diverse a seconda  
della tensione utilizzata.  
Sempre use com a voltagem de linha correta. Se refira ao fabricante está operando  
instruções para as exigências de poder. Seja aconselhado que voltagens operacionais  
diferentes requeiram para o uso uma corda de linha diferente ou tomada de anexo.  
•
•
Não instale esta unidade em uma prateleira de unventilated, nem diretamente sobre  
artigos que geram calor, como amplificadores de poder. Observe o máximo que  
temperatura operacional ambiente listou na especificação de produto.  
•
•
Non installare l’unità in uno scaffale privo di ventilazione oppure direttamente sopra  
una fonte di calore, come, ad esempio, un amplificatore. Non superare la temperatura  
ambientale massima di funzionamento riportata nei dati tecnici del prodotto.  
São providas as aberturas no caso para ventilação; assegurar operação segura e impedir  
isto de aquecer demais, não devem ser bloqueadas estas aberturas ou devem ser  
cobertas. Nunca empurre objetos de qualquer amável por quaisquer das aberturas de  
ventilação. Nunca derrame qualquer líquido na unidade.  
Le fessure  
e
le altre aperture nella scatola servono alla ventilazione. Per un  
funzionamento affidabile, e per evitare un eventuale surriscaldamento, queste aperture  
non vanno ostruite o coperte in nessun modo. Evitare in tutti i casi di inserire oggetti  
di qualsiasi genere attraverso le fessure di ventilazione. Non versare mai del liquido di  
nessun tipo sull’unità.  
•
•
Nunca prenda amplificador de poder auditivo produz diretamente a quaisquer dos  
conectores da unidade.  
•
•
•
Questo prodotto viene fornito con una spina a 3 fili con massa. Tale dispositivo di  
sicurezza non va eliminato.  
Prevenir choque ou perigo de incêndio, não exponha a unidade para chover ou  
umidade, ou opera isto onde será exposto a umidade. Não tente operar a unidade se  
foi derrubado, estragado, exposto a líquidos, ou se exibe uma mudança distinta em  
desempenho que indica a necessidade por serviço. Esta unidade só deveria ser aberta  
através de pessoal de serviço qualificado. Removendo coberturas o exporão a voltagens  
perigosas.  
Evitare sempre di collegare le uscite dell’amplificatore audio direttamente ai connettori  
dell’unità.  
Per prevenire il pericolo di folgorazione e di incendio non esporre l’unità alla pioggia o  
ad un’umidità eccessiva; evitare di adoperare l’unità dove potrebbe entrare in contatto  
con acqua.  
•
•
Evitare di adoperare l’unità se la stessa è stata urtata violentemente, se ha subito un  
danno, se è stata esposta ad un liquido o in caso di un evidente cambiamento delle  
prestazioni che indichi la necessità di un intervento di assistenza tecnica.  
Este triângulo que se aparece em seu componente o alerta à presença de  
uninsulated, voltagem perigosa dentro do enclosure - voltage que pode ser  
suficiente para constituir um risco de choque.  
Ogni intervento sull’unità va eseguito esclusivamente da personale qualificato. La  
rimozione della copertura comporta l’esposizione al pericolo di folgorazione.  
Este triângulo que se aparece em seu componente o alerta a operando  
importantes e instruções de manutenção nesta literatura acompanhante.  
Il presente triangolo impresso sul componente avverte della presenza di  
tensioni pericolose non isolate all’interno della copertura  
rappresentano un pericolo di folgorazione.  
-
tali tensioni  
Il presente triangolo impresso sul componente avverte l’utente della presenza  
nella documentazione allegata di importanti istruzioni relative al funziona  
ento ed alla manutenzione.  
vi  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
MPX 550  
DANSK  
SUOMI  
TÄRKEITÄ TURVALLISUUSOHJEITA  
DK  
DK  
FI  
FI  
VIGTIG INFORMATION OM SIKKERHED  
Gem denne vejledning til senere brug.  
Säilytä nämä ohjeet tulevaa käyttöä varten.  
•
•
Følg alle anvisninger og advarsler på apparatet.  
•
•
Seuraa kaikkia yksikköön merkittyjä ohjeita ja varoituksia.  
Apparatet skal altid tilsluttes den korrekte spænding. Der henvises til brugsanvisningen,  
der indeholder specifikationer for strømforsyning. Der gøres opmærksom på, at ved  
varierende driftsspændinger kan det blive nødvendigt at bruge andre lednings- og/eller  
stiktyper.  
Käytä aina oikeaa verkkojännitettä. Tehovaatimukset selviävät valmistajan  
käyttöohjeista. Huomaa, että eri käyttöjännitteet saattavat vaatia toisenlaisen  
verkkojohdon ja/tai -pistokkeen käytön.  
•
•
•
Älä asenna yksikköä telineeseen jossa ei ole tuuletusta, tai välittömästi lämpöä  
tuottavien laitteiden, esim. tehovahvistimien, yläpuolelle. Ympäristön lämpötila  
käytössä ei saa ylittää tuotespesifikaation maksimilämpötilaa.  
•
•
Apparatet må ikke monteres i et kabinet uden ventilation eller lige over andet udstyr,  
der udvikler varme, f.eks. forstærkere. Den maksimale omgivelsestemperatur ved drift,  
der står opført i specifikationerne, skal overholdes.  
Kotelo on varustettu tuuletusreiillä ja -aukoilla. Luotettavan toiminnan varmistamiseksi  
ja ylilämpenemisen välttämiseksi näitä aukkoja ei saa sulkea tai peittää. Mitään esineitä  
ei saa työntää tuuletusaukkoihin. Mitään nesteitä ei saa kaataa yksikköön.  
Der er ventilationsåbninger  
i
kabinettet. For at sikre apparatets drift og hindre  
overophedning må disse åbninger ikke blokeres eller tildækkes. Stik aldrig noget ind  
igennem ventilationsåbningerne, og pas på aldrig at spilde nogen form for væske på  
apparatet.  
Tuote on varustettu 3-johtimisella maadoitetulla verkkopistokkeella. Tämä on  
turvallisuustoiminne eikä sitä saa poistaa.  
•
Dette apparat er forsynet med et stik med jordforbindelse. Denne sikkerhedsforan  
staltning må aldrig omgås.  
•
•
Älä kytke audiotehovahvistimen lähtöjä suoraan mihinkään yksikön liittimeen.  
Sähköiskun ja palovaaran välttämiseksi yksikkö ei saa olla sateessa tai kosteassa, eikä sitä  
saa käyttää märässä ympäristössä.  
•
•
Udgangsstik fra audioforstærkere må aldrig sættes direkte i apparatet.  
Apparatet må ikke udsættes for regn eller fugt og må ikke bruges i nærheden af vand  
for at undgå risiko for elektrisk stød og brand.  
•
•
Älä käytä yksikköä jos se on pudonnut, vaurioitunut, kostunut, tai jos sen suorituskyky  
on huomattavasti muuttunut, mikä vaatii huoltoa.  
•
•
Apparatet må aldrig bruges, hvis det er blevet stødt, beskadiget eller vådt, eller hvis  
ændringer i ydelsen tyder på, at det trænger til eftersyn.  
Yksikön saa avata vain laitteeseen perehtynyt huoltohenkilö. Kansien poisto altistaa  
sinut vaarallisille jännitteille.  
Dette apparat må kun åbnes af fagfolk. Hvis dækslet tages af, udsættes man for livsfarlig  
højspænding.  
Tämä kolmio, joka esiintyy komponentissasi, varoittaa sinua eristämättömän  
vaarallisen jännitteen esiintymisestä yksikön sisällä. Tämä jännite saattaa olla  
riittävän korkea aiheuttamaan sähköiskuvaaran.  
Denne mærkat på komponenten advarer om uisoleret, farlig spænding i  
apparatet - høj nok til at give elektrisk stød.  
Tämä kolmio, joka esiintyy komponentissasi, kertoo sinulle, että tässä  
tuotedokumentoinnissa esiintyy tärkeitä käyttö- ja ylläpito-ohjeita.  
Denne mærkat på komponenten advarer om vigtig driftsog vedligeholdsin-  
formation i den tilhørende litteratur.  
vii  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
Lexicon  
NORSK  
VIKTIG INFORMASJON OM SIKKERHET  
SVENSKA  
VIKTIGA SÄKERHETSFÖRESKRIFTER  
NO  
NO  
SE  
SE  
Ta vare på denne veiledningen for senere bruk.  
Spara dessa föreskrifter för framtida bruk.  
•
•
Følg alle anvisningene og advarslene som er angitt på apparatet.  
•
•
Följ alla anvisningar och varningar som anges på enheten.  
Apparatet skal alltid anvendes med korrekt spenning. Produktbeskrivelsen inneholder  
spesifikasjoner for strømkrav. Vær oppmerksom på at det ved ulike driftsspenninger kan  
være nødvendig å bruke en annen ledning- og/eller støpseltype.  
Använd alltid rätt nätspänning. Se tillverkarens bruksanvisningar för information om  
effektkrav. Märkväl, att andra matningsspänningar eventuellt kräver att en annan typs  
nätsladd och/eller kontakt används.  
•
•
Apparatet skal ikke monteres  
varmeproduserende utstyr, som for eksempel kraftforsterkere. Den maksimale  
romtemperaturen som står oppgitt i produktbeskrivelsen, skal overholdes.  
i
skap uten ventilasjon, eller direkte over  
•
•
Installera inte enheten i ett oventilerat stativ, eller direkt ovanför utrustningar som avger  
värme,  
t
ex effektförstärkare. Se till att omgivningens temperatur vid drift inte  
överskrider det angivna värdet i produktspecifikationen.  
Apparatet er utstyrt med ventilasjonsåpninger. For at apparatet skal være pålitelig i bruk  
og ikke overopphetes, må disse åpningene ikke blokkeres eller tildekkes. Stikk aldri noe  
inn i ventilasjonsåpningene, og pass på at det aldri søles noen form for væske på  
apparatet.  
Behållaren är försedd med hål och öppningar för ventilering. För att garantera  
tillförlitlig funktion och förhindra överhettning får dessa öppningar inte blockeras eller  
täckas. Inga föremål får skuffas in genom ventilationshålen. Inga vätskor får spillas på  
enheten.  
•
Dette apparatet er utstyrt med et jordet støpsel. Dette er en sikkerhetsforanstaltning  
som ikke må forandres.  
•
Produkten är försedd med en jordad 3-trådskontakt. Detta är en säkerhetsfunktion som  
inte får tas ur bruk.  
•
•
Utgangsplugger fra audioforsterkere skal aldri koples direkte til apparatet.  
•
•
Anslut aldrig audioeffektförstärkarutgångar direkt till någon av enhetens kontakter.  
Unngå brannfare og elektrisk støt ved å sørge for at apparatet ikke utsettes for regn eller  
fuktighet og ikke anvendes i nærheten av vann.  
För att undvika elstöt eller brandfara får enheten inte utsättas för regn eller fukt, eller  
användas på ställen där den blir våt.  
•
•
Apparatet skal ikke brukes hvis det har blitt utsatt for støt, er skadet eller blitt vått, eller  
hvis endringer i ytelsen tyder på at det trenger service.  
•
•
Använd inte enheten om den har fallit i golvet, skadats, blivit våt, eller om dess  
prestanda förändrats märkbart, vilket kräver service.  
Dette apparatet skal kun åpnes av fagfolk. Hvis dekselet fjernes, utsettes man for  
livsfarlig høyspenning.  
Enheten får öppnas endast av behörig servicepersonal. Farliga spänningar blir  
tillgängliga när locken tas bort.  
Komponenten er merket med denne trekanten, som er en advarsel om at det  
finnes uisolert, farlig spenning inne i kabinettet - høy nok til å utgjøre en fare  
for elektrisk støt.  
Denna triangel, som visas på din komponent, varnar dig om en oisolerad  
farlig spänning inne i enheten. Denna spänning är eventuellt så hög att fara  
för elstöt föreligger.  
Komponenten er merket med denne trekanten, som betyr at den tilhørende  
litteraturen inneholder viktige opplysninger om drift og ved  
Denna triangel, som visas på din komponent, anger att viktiga  
bruksanvisningar och serviceanvisningar ingår i dokumentationen i fråga.  
viii  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
MPX 550  
Important User Information  
Unpacking and Inspection  
US  
Lexicon is pleased to present its user guides on CD-ROM.  
By utilizing CD-ROM technology we are able to provide  
our documentation in multiple languages.  
After unpacking the unit, save all packing materials in  
case the unit ever needs to be shipped. Thoroughly  
inspect the modules and packing materials for signs of  
damage. Report any damage to the carrier at once;  
report equipment malfunction to the dealer.  
The printed edition of the user guide is in English only.  
The enclosed CD-ROM includes the user guide in  
multiple languages (French, German, Italian, Portuguese,  
and Spanish) in easy-to-use PDF format. The CD-ROM  
also includes Adobe® Acrobat® Readers for both PC and  
Macintosh platforms, enabling printing of all or any part  
of the documents. In addition, we have included dry  
audio tracks for product demonstrations. (Track 1  
contains non-audio data.)  
Please take a moment to read through the important  
safety information. For additional information about  
Lexicon, Inc., our products and support, please visit our  
web site at www.lexicon.com.  
ix  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
Lexicon  
Wichtige Benutzerinformation  
Auspacken und Überprüfung  
DE  
Lexicon ist erfreut, seine Benutzerhandbücher nun auch  
auf CD-ROM vorlegen zu können. Durch den Einsatz von  
CD-ROM-Technologie können wir unsere Dokumentation  
in verschiedenen Sprachen zur Verfügung stellen.  
Bewahren Sie nach dem Auspacken des Geräts das  
Verpackungsmaterial für den Fall auf, dass Sie das Gerät  
wieder versenden müssen. Überprüfen Sie die Module  
und die Verpackung sorgfältig auf Anzeichen von  
Beschädigung. Etwaige Schäden sind dem Transporteur  
unverzüglich anzuzeigen; Funktionsstörungen sind dem  
zuständigen Händler zu melden.  
Die gedruckte Ausgabe des Benutzerhandbuchs ist nur in  
englischer Sprache verfügbar. Die beigelegte CD-ROM  
enthält das Benutzerhandbuch in verschiedenen  
Sprachen (spanisch, französisch, italienisch, deutsch und  
portugiesisch) im leicht zu benutzenden PDF-Format.  
Die CD-ROM enthält auch Adobe® Acrobat® Reader  
sowohl für PC wie auch für Macintosh; mit ihm ist es  
möglich, das gesamte Dokument oder Teile davon  
auszudrucken. Darüber hinaus befinden sich auf der  
CD-ROM Audio-Tracks zur Produktdemonstration.  
(Track 1 enthält keine Audio-Daten.)  
Nehmen Sie sich bitte einen Augenblick Zeit und lesen  
Sie die wichtigen Sicherheitshinweise. Weitere  
Informationen über Lexicon, Inc., sowie über unsere  
Produkte und unseren Support finden Sie auf unserem  
Website unter www.lexicon.com.  
x
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
MPX 550  
Información importante para el  
usuario  
Lexicon se complace en presentar sus manuales de  
usuario en CD-ROM. Gracias a la utilización de la  
tecnología de CD-ROM, nosotros podemos ofrecer  
nuestra documentación en múltiples idiomas.  
Desembalaje e inspección  
ES  
Después de desembalar la unidad, guarde todos los  
materiales de embalaje por si alguna vez transportar la  
unidad. Inspeccione con atención los módulos y los  
materiales de embalaje para comprobar que no  
muestren desperfectos. Informe inmediatamente de  
cualquier desperfecto al transportista; informe de  
cualquier problema de funcionamiento del equipo a su  
distribuidor.  
La edición impresa del manual del usuario sólo está  
disponible en inglés. El CD-ROM que se entrega incluye  
el manual del usuario en múltiples idiomas (español,  
francés, italiano, alemán y portugués) en formato PDF. El  
CD-ROM también incluye Adobe® Acrobat® Readers  
para plataformas tanto PC como Macintosh, lo cual  
permite la impresión de todos o parte de los  
documentos. Además, hemos incluido pistas de audio  
sin efectos para demostraciones de los productos. (La  
pista 1 contiene información que no es de audio.)  
Dedique unos momentos a leer la información de  
seguridad importante. Si desea información adicional  
acerca de Lexicon, Inc., nuestros productos o nuestra  
asistencia, visite nuestro sitio web en www.lexicon.com.  
xi  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
Lexicon  
Important - Informations Utilisateur  
Contenu de l’emballage et inspection  
FR  
Nous sommes fiers de présenter nos modes d’emploi en  
version CD-ROM. L’utilisation des CD-ROM nous  
per-mettent de décliner nos manuels en plusieurs  
langues.  
Après avoir ouvert l’emballage, conservez-le pour tout  
retour. Inspectez avec soin les modules et les matériaux  
d’emballage pour tout signe de dommage. Veuillez  
rapporter immédiatement les dommages auprès du  
transporteur. Les dysfonctionnements du matériel  
doivent être signalés à votre revendeur.  
La version imprimée de ce manuel existe uniquement en  
anglais. Le CD-ROM regroupe les versions espagnole,  
française, italienne, allemande et portugaise au format  
PDF. Le CD-ROM comprend également Adobe®  
Acrobat® Reader pour PC et Macintosh, ce qui vous  
permet d’imprimer les documents en toute ou partie. De  
plus, nous avons ajouté des pistes audio sans traitement  
pour la démonstration du produit (la piste 1 contient des  
données non audio).  
Prenez le temps de lire les informations relatives à la  
sécurité. Pour obtenir de plus amples informations sur  
Lexicon, Inc., nos produits et notre service clientèle,  
consultez notre site web à l’adresse : www.lexicon.com.  
xii  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
MPX 550  
Importanti informazioni per l’utente  
Disimballaggio ed ispezione  
IT  
Lexicon è lieta di presentare i propri manuali su CD-  
ROM. Utilizzando la tecnologia su CD-ROM siamo stati  
capaci offrire la nostra documentazione in più lingue.  
Dopo aver disimballato l’unità, salvi tutto il materiale  
d’imballaggio, in caso Lei abbia bisogno di spedire  
l’unità. Ispezioni attentamente i moduli ed il materiale  
d’imballaggio per vedere se riportano segni di danno.  
Riporti subito ogni segno di danno al corriere; riferisca il  
malfunzionamento dell’attrezzatura al suo rivenditore.  
L’edizione stampata del manuale è solamente in inglese.  
Il CD-ROM contiene il manuale in diverse lingue  
(Spagnolo, Francese, Italiano, Tedesco, e Portoghese)in  
formato PDF, facile da utilizzare. Il CD-ROM include  
anche Adobe‚, Acrobat‚ Reader per PC e per Macintosh,  
rendendo possibile la stampa di tutta la  
documentazione. Inoltre Sono incluse tracce audio per  
dimostrazioni del prodotto. (La Traccia 1 contiene dati  
non audio).  
Si prega di prendere un momento per leggere le  
importanti norme di sicurezza. Per ulteriori informazioni  
riguardo Lexicon, Inc., i nostri prodotti e la nostra  
assistenza, visiti il nostro sito internet www.lexicon.com.  
xiii  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Introduction  
Lexicon  
Informações Importantes ao usuário  
Retirando a embalagem e Inspecionando  
PT  
A Lexicon tem o prazer de apresentar o Guia do Usuário  
em CD-ROM. Através da tecnologia CD-ROM temos a  
possibilidade de fornecer nossa documentação em vários  
idiomas.  
Depois de desembalar a unidade, guarde a embalagem  
caso precise enviar a unidade para manutenção.  
Inspecione cuidadosamente o módulo e a embalagem  
procurando sinais de dano. Avise à loja qualquer tipo de  
dano ou mal funcionamento do equipamento.  
A versão impressa do Guia do Usuário está apenas em  
Inglês. O CD-ROM contém o Guia do Usuário em vários  
idiomas (Espanhol, Francês, Italiano, Alemão  
e
Português) em formato PDF. Também inclui o aplicativo  
Adobe Acrobat Reader para as plataformas Macintosh e  
PC, possibilitanto a impressão de qualquer parte da  
documentação. Além disso, incluimos faixas no CD com  
áudio sem processamento para a demosntração dos  
produtos. (A faixa 1 do CD não contém informação de  
áudio.)  
Por favor separe uns instantes para ler as informações  
sobre segurança. Elas são muito importantes. Para  
informações adicionais sobre a Lexicon, Inc., nossos  
produtos e suporte, acesse nosso web site em  
www.lexicon.com.  
xiv  
Download from Www.Somanuals.com. All Manuals Search And Download.  
1
Getting Started  
About the MPX 550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
Highlights  
Front Panel Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4  
Front Panel Display  
Rear Panel Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8  
Connecting the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10  
Footswitch • Typical Connections to a Console  
Setting Audio Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12  
Input • Output  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
Lexicon  
The editing process is further simplified with dedicated  
EDIT knobs that correspond to displayed parameters, as  
well as a special "Adjust" parameter for each program  
that facilitates quick changes to the most critical aspect  
of the sound. In many cases, this custom parameter  
controls several program parameters at once. For  
instance, it controls the liveness of space in many  
Chamber and Room programs by changing Decay, Early  
Reflections, and EQ simultaneously.  
ABOUT THE MPX 550  
Thank you for purchasing the MPX 550 Dual Channel  
Processor, featuring Lexicon’s proprietary Lexichip®.  
The MPX 550 is a true stereo, dual-channel processor  
with 24-bit internal processing, analog-to-digital  
conversion, and digital-to-analog conversion. It offers  
255 presets with classic Lexicon reverb, including  
Tremolo, Rotary, Chorus, Flange, Pitch, Detune, 5.5  
second Delay, Echo, and Compression. Dual-channel  
processing creates two independent effects in  
Dual Stereo (Parallel), Cascade, Mono Split, and Dual  
Mono combinations.  
Tap Tempo simplifies the once-complicated process of  
matching the delay times and modulation rates of  
tempo-based programs to the music. Tempo-controlled  
delays and modulation rates lock to tempo. In addition,  
Tap Tempo can be controlled using the front panel  
Tap/Cancel button, audio input, a dual footswitch, or an  
external MIDI controller that utilizes MIDI Continuous  
Controller or Program Change messages.  
A large, graphic front panel display provides at-a-glance  
viewing of program and system status. Programs are  
organized into 28 banks, with 27 for presets and 1 for  
user programs. The PROGRAM knob scrolls through all  
stored programs, or between banks for faster selection.  
Each program includes up to 20 adjustable parameters,  
which are organized into “Edit Pages" that consist of four  
parameters each. The Edit Pages button cycles through  
available Edit Pages for the selected program.  
The MPX 550 features Learn Mode, a powerful editing  
tool that allows MIDI patching of all parameters, as well  
as the Bypass and Tap/Cancel buttons. Standard  
Continuous Controller and Program Change messages  
provide complete control of these functions.  
1-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
MPX 550  
HIGHLIGHTS  
•
•
•
•
Lexicon’s proprietary Lexichip  
World-class Lexicon reverb  
24-bit internal processing  
•
•
•
Simultaneous analog and digital outputs  
Independent processing of each input  
Dual programs that create two independent effects  
with four routing configurations  
24-bit analog-to-digital and digital-to-analog  
conversion  
•
Dual effects that combine Delay with Reverb, or  
either Delay or Reverb with Chorus, Flange, or Pitch  
•
•
•
•
•
•
255 presets  
•
•
Multiple delay, modulation, and pitch effects  
64 user programs  
Tap Tempo for instant setting of delay times and  
modulation rates (may be set using a footswitch)  
Mastering Dynamics algorithm  
Large, graphic front panel display  
Four EDIT knobs for simple parameter adjustment  
•
•
•
Full MIDI control  
Universal internal switching power supply  
S/PDIF IN and OUT connectors (may be set to wet or  
dry to accommodate use as a high-quality, stand-alone  
converter)  
MIDI IN and software-selectable MIDI OUT/THRU  
ports  
•
Push-button or footswitch selection of dry or muted  
audio output  
•
Balanced analog inputs and outputs (1/4 inch and  
XLR)  
1-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
Lexicon  
FRONT PANEL OVERVIEW  
1
2
4
6
8
11  
3
5
7
9
10  
1. Input Trim  
3. System  
Adjusts the level of the incoming analog input signal.  
Toggles between activating and deactivating System  
Mode. When System Mode is activated, EDIT knob 1  
selects parameters; EDIT knob 3 changes the setting  
of the selected parameter. (See Section 3 for more  
information about System Mode.)  
2. Edit Pages  
Cycles through available Edit Pages for the selected  
program. The LED lights to indicate that a program  
has been modified but not stored.  
1-4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
MPX 550  
4. EDIT Knobs  
9. Store  
Adjust parameters. Numbers 1 to 4 correspond to  
numbers 1 to 4 beneath the front panel display.  
Activates store functions. When pressed with Tap,  
enters MIDI Learn Mode (see page 6-2).  
5. Front Panel Display  
10. Tap/Cancel  
Indicates information about the current program.  
(See page 1-6 for more information about the front  
panel display).  
Flashes to indicate tempo-based programs. When  
pressed twice, sets tempo. When held, uses input  
level or dialed-in value to determine tempo. When  
pressed with Store, enters MIDI Learn Mode (see  
page 6-2).  
6. Load  
Loads the selected program. The LED lights when  
another program is cued.  
11. Power  
Powers the unit on and off.  
7. Bypass  
Mutes or bypasses the incoming signal, depending  
on the setting of the System Mode parameter Bypass  
Mode (see page 3-5).  
8. PROGRAM  
Scrolls through available programs and, when  
pushed inward, program banks.  
1-5  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
Lexicon  
Input level meters show calibrated values, with 0dB  
indicating digital saturation. Markings on the open  
portion of each level meter show -6, -18, and -32dB.  
The meters have single-pixel precision in which each  
pixel represents 2dB.  
FRONT PANEL DISPLAY  
3
4
7
1
2
8
6
S/PDIF digital input sources that have been mastered  
“hot” (at the maximum bit rate) will cause the input  
level meters to peak as if digital full-scale is  
occurring. However, the unit is just receiving the  
maximum output from the source, which is loud  
enough to peak the meters. This is not a problem as  
long as the source audio is not distorted.  
5
9
1. Input Level Meters  
Gain reduction from the compressor is indicated by  
a descending bar situated between the two input  
level meters. It is also calibrated in 2dB increments  
per pixel.  
Indicate incoming signal levels. Input level meters  
show a minimum when the incoming signal is more  
than -48dB digital full-scale. Level meters appear in  
inverse video when the signal approaches overload  
(-2dB digital full-scale). When signals are between  
these extremes, the level meters appear as shown  
above.  
2. Input/OVL Indicator  
Reflects the input type in normal operation. The first  
letter indicates input type, which is selected with the  
System Mode parameter Input Source (see page 3-4).  
1-6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
MPX 550  
"S" stands for stereo, "L" stands for mono left, "R"  
5. Bank Name  
Indicates the name of the selected bank.  
stands for mono right, and "D" stands for digital.  
"NoD" appears when digital input is selected, but no  
valid digital audio signal is present. The number after  
the letter indicates the sample rate (44.1 or 48kHz).  
6. EDIT Knobs 1 to 4  
Indicates the function of EDIT knobs 1 to 4.  
When the processor is in saturation, the letters "OVL"  
overwrite the input type indicator. This signals the  
need to reduce input levels or the value of a  
parameter on the verge of feedback. "OVL" does not  
indicate input overload.  
7. Tempo  
Indicates the current tempo as well as the current  
setting of the System Mode parameter Tempo Mode  
(see page 3-5) - "P" for Program, "G" for Global. If  
the current program is not affected by tempo, this  
area of the display will be blank.  
3. Program Number  
Indicates the number of the program that is loaded.  
When a different program is cued, its number will  
appear in inverse video below the program number  
after a period of time.  
8. Routing Configuration  
Shows the routing configuration for the selected  
program (see page 4-18).  
4. Program Name  
9. Messages  
Indicates the name of the selected program.  
Displays miscellaneous information, such as MIDI  
activity, Bypass state, S/PDIF status, etc. When no  
messages are required, this area of the display will be  
blank (as pictured on the previous page).  
1-7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
Lexicon  
REAR PANEL OVERVIEW  
2
3
4
6
1
5
1. AC Input Connector  
3. FOOTSWITCH  
Provides power to the unit with the supplied power  
cord.  
Allows footswitch control of front panel Bypass and  
Tap functions. A 1/4 inch Tip/Ring/Sleeve connector  
and a momentary contact footswitch are available.  
(See page 1-10 for more information.)  
2. MIDI IN and MIDI OUT/THRU  
Two 5-pin DIN MIDI connectors are available for  
MIDI IN and software-selectable MIDI OUT/THRU.  
Tip  
Sleeve  
Tip  
Tap  
Ring  
Sleeve  
Bypass  
Ring  
1-8  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
MPX 550  
4. S/PDIF IN and OUT  
Provide digital audio input and output. Two RCA  
S/PDIF connectors are available. The unit accepts  
inputs at 44.1 or 48kHz.  
5. ANALOG OUTPUTs  
Provide analog audio output. Balanced outputs are  
available on either XLR or 1/4 inch Tip/Ring/Sleeve  
connectors.  
6. ANALOG INPUTs  
Provide analog audio input. Balanced inputs are  
available on either XLR or 1/4 inch Tip/Ring/Sleeve  
connectors.  
1-9  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
Lexicon  
CONNECTING THE UNIT  
Note:  
The INPUT and OUTPUT connectors on the MPX 550 are  
1/4 inch Tip/Ring/Sleeve and XLR sockets. Either may be  
used. Connections should be made utilizing high-quality  
shielded cables.  
Power off the unit prior to connecting the  
footswitch; otherwise, Bypass functions will be  
enabled.  
The MPX 550 produces effects from either mono or  
stereo sources. Either input can be used for mono  
sources. It is recommended to use stereo outputs  
whenever possible. Only material with Dual Mono  
routing is designed for mono outputs. Use either output  
connector if mono output is required.  
Dual-Function Footswitch  
A dual-function footswitch with  
a set of labels to indicate Tap  
and Bypass functionality is  
available at Lexicon dealers or  
at www.lexicon.com.  
BYPASS  
TAP  
FOOTSWITCH  
A footswitch connected to the rear panel FOOTSWITCH  
connector can be used to control front panel Tap and  
Bypass functions. A momentary footswitch can be wired  
to a Tip/Ring/Sleeve connector. A stereo Y-connector  
allows two identical switches to be used.  
1-10  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
MPX 550  
TYPICAL CONNECTIONS TO A CONSOLE  
LEFT Out  
RIGHT Out  
Ch7  
Ch8  
LEFT In  
RIGHT In  
Aux Send 1  
Aux Send 2  
1-11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Getting Started  
Lexicon  
The Input Trim knob allows the unit to be driven by  
an input level within a range of +8 to +20dBu. The  
minimum setting (fully counterclockwise) should be  
optimal for +4dBu (balanced) inputs. The maximum  
setting (fully clockwise) should be optimal for  
-10dBV (unbalanced) inputs.  
SETTING AUDIO LEVELS  
Note:  
As with all audio products, it is good practice to first  
power on all outboard equipment, then the mixer,  
then the speakers.  
OUTPUT  
INPUT  
1. Load Program 1.  
1. Press the front panel System button to activate  
System Mode. Output Level, the first System Mode  
parameter, will be displayed.  
2. Set the Mix parameter to Dry (Edit Page 1, EDIT  
knob 4).  
2. Turn EDIT knob 3 to set the Output Level parameter.  
Unity gain for a +4dBu input device should be -12dB.  
3. Using high-level program material, begin with a low  
input level and advance it slowly.  
3. Press the System button again to deactivate System  
Mode.  
4. When audible distortion is reached or when the  
display clip indicators light and remain lit, lower the  
input level until the clip meters appear only on the  
highest peaks.  
1-12  
Download from Www.Somanuals.com. All Manuals Search And Download.  
2
Basic Operation  
Selecting and Loading Programs . . . . . . . . . . . . . . . . . . . . . . . . . 2-2  
Editing Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3  
The “Adjust” Parameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3  
Storing Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4  
The Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5  
Tap Tempo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6  
Matching Rhythm • Audio Tap • Global Tempo  
Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Basic Operation  
Lexicon  
The name and number of the selected program appear  
on the front panel display (see page 1-6). The  
Load LED will light to indicate that the selected  
program is cued for loading. After 4 seconds,  
the front panel display will revert to showing the name  
and number of the loaded program. However, the Load  
LED will remain lit to indicate that the selected program  
is still cued for loading. The number of the cued program  
will appear in inverse video below the number of the  
currently loaded program. To load the cued program,  
press the front panel Load button.  
SELECTING AND LOADING PROGRAMS  
When powered on, the unit will load the last program  
that was loaded during the previous operating session.  
To select another program, turn the front panel  
PROGRAM knob.  
When the PROGRAM knob is turned clockwise, the unit  
will cycle forward through programs in the selected  
bank, then proceed to cycle forward through programs  
in the next bank. When turned counterclockwise, the  
unit will cycle backward through programs in the  
selected bank, then proceed to cycle backward through  
programs in the previous bank. When the PROGRAM  
knob is pushed inward and turned, the unit will cycle  
through program banks.  
The unit can be configured to automatically load  
programs 3/4 second after the PROGRAM knob stops  
turning. To do this, set the System Mode parameter Auto  
Load to Enabled (see page 3-7).  
Turn the PROGRAM knob clockwise to  
cycle forward through all programs.  
Turn the PROGRAM knob counterclockwise to  
cycle backward through all programs.  
Press and turn the PROGRAM knob to  
select a program bank.  
2-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Basic Operation  
MPX 550  
EDITING PROGRAMS  
THE "ADJUST" PARAMETER  
Each program features up to 20 parameters, which are  
organized into Edit Pages with as many as four parameters  
each. Press the front panel Edit Pages button  
to cycle through available Edit Pages for the  
loaded program.  
An "Adjust" parameter has been customized for  
individual programs, and in most cases controls several  
parameters at once to handle complicated editing  
processes. For instance, "Adjust" controls the liveness of  
space in Chamber and Room programs by changing  
Decay, Early Reflections, and EQ simultaneously.  
Parameters available on the selected Edit Page appear  
across the bottom of the front panel display, as shown on  
page 1-6. The number below each parameter  
corresponds with the number above the Edit knob used  
to change its setting. When a parameter setting is  
changed, it will appear in inverse video on the front  
panel display and the Edit Pages LED will light to show  
that the program has been modified. The LED will no  
longer be lit when another program is loaded or if the  
modified version is stored.  
The "Adjust" parameter is located on Edit  
Page 1 and controlled with EDIT knob 1. It  
appears in parenthesis, such as (MidRT)  
pictured at the right. When EDIT knob 1 is  
turned, the bottom line of the front panel  
display shows a more complete description of the  
parameter function in that program. The "Adjust"  
parameter is MIDI-compatible with a range of 0 to 127.  
If another program is selected before the modified  
program is stored, the edited version will still appear as  
the loaded program. However, the Load LED  
will light to indicate that a new program is cued  
for loading.  
2-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Basic Operation  
Lexicon  
3. The program appears on the front panel with its  
original name and a numeric suffix. If desired, use  
EDIT knobs 1 and 3 to change the name of the  
program.  
STORING PROGRAMS  
The User Bank contains no programs when the MPX 550  
is shipped. However, it includes 64 memory locations  
available for storing user-modified programs.  
4. Press the Store button to save the program to the  
selected location. The message "Stored" will appear  
briefly on the display. The Edit LED will no longer be  
lit when the saved version becomes the selected  
program.  
To store a program:  
1. Press the Store button. The Store and  
Tap/Cancel LEDs will light to indicate that  
the store function is armed. The first empty  
User Bank location will be selected.  
Note:  
When storing a user program, allow the unit to  
complete the entire store process before powering  
the unit off. If the unit is power cycled during the  
process, all previously stored programs may be lost.  
To cancel the store function without saving  
the program, press the Tap/Cancel button.  
This can be done at any time before the  
store procedure is completed.  
2. Use the PROGRAM knob to select a different User  
Bank location. The message area on the front panel  
display (see page 1-6) indicates whether the selected  
User Bank location is available or empty.  
2-4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Basic Operation  
MPX 550  
For most music material, the release time should be  
about four times longer than the attack time. Both must  
be long enough to accommodate the bass content of the  
music.  
THE COMPRESSOR  
The compressor is available in all programs, except  
Dynamics. (Dynamics uses a different compression  
mechanism, explained on page 4-33.) The compressor  
sits in the wet component of the signal in front of the  
effects in the loaded program. It is controlled with four  
parameters: CmpRatio, Threshld, CmpAttk, and  
CmpRels. These parameters are located on the last Edit  
Page for each program, except those in the Cmprssr  
Bank.  
If the compressor is set to react faster than the waveform  
of the music itself, the resulting changes in output level  
will re-shape the waveform enough to produce  
undesirable audio effects. For example, 80Hz has a  
period of 12ms. If this is a dominant component in the  
music, set both the attack and release parameters to at  
least 12ms, even higher for better results. The  
compressor acts on both the left and right channels at  
the same time, using the sum of the two channels as its  
trigger.  
The ratio (CmpRatio) parameter can be set to ratios of  
1:1 (off), 2:1, 3:1, 4:1, 5:1, and 10:1. The threshold  
(Threshld) parameter can be set within a 0 to -32dB  
range. These settings are relative to 0dBFS (digital  
saturation). The compressor is disabled if either the ratio  
parameter is set to 1:1 or the threshold parameter is set  
high enough to prevent the incoming signal from  
crossing the compression threshold.  
Compression presets are available in the Cmprssr Bank  
(see page 4-31). For other compression-only effects,  
send compressor output into a Dly/Eko program with  
the Delay parameter set to 0. The compressor does not  
add propagation delay to the audio path. (Note the  
converters introduce about 2ms of propagation delay.)  
The attack (CmpAttk) and release (CmpRels) parameters  
determine how fast the compressor responds, within  
3dB of the output level dictated by the incoming signal.  
2-5  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Basic Operation  
Lexicon  
TAP TEMPO  
AUDIO TAP  
To use audio input to set tempo:  
MATCHING RHYTHM  
1. Press and hold the Tap/Cancel button until the  
message "Detecting audio..." appears at the top of  
the front panel display. (The optional dual footswitch  
allows the musician to continue playing the  
instrument while pressing and holding the Tap  
button.)  
Tap Tempo can be used to match the delay times and  
modulation rates of tempo-based programs with those  
of the music. The Tap/Cancel button LED will flash  
whenever a tempo-based program is loaded. The current  
tempo rate appears in the top-right corner of the front  
panel display.  
Tempo parameters available for the loaded program  
will also appear on the front panel display.  
It is not required to enter what "could be" the  
delay time in milliseconds. Just press the  
Tap/Cancel button twice, and the unit will  
calculate the appropriate delay time. To change tempo,  
press the Tap/Cancel button twice again in the new  
rhythm.  
2. Still holding the Tap/Cancel button, play two short  
notes in rhythm.  
3. Release the Tap/Cancel button. The message "Knob  
3 to change" will appear at the top of the front panel  
display to indicate that EDIT knob 3 is now available  
to adjust tempo.  
Tempo can also be set with a footswitch (see page 1-10)  
or MIDI control device (see page 6-4).  
2-6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Basic Operation  
MPX 550  
4. If desired, turn EDIT knob 3 to further adjust tempo  
in bpm (beats per minute).  
parameter Tempo Mode to Global. The unit will ignore  
individual tempo settings and apply the current tempo  
setting to each program as it is loaded.  
5. Press the Tap/Cancel button to exit this mode.  
BYPASS  
The Bypass button can be used to force the unit  
to pass only dry audio, to mute the outputs  
immediately, or to mute the inputs to the  
loaded program. Its function depends on the setting of  
the System Mode parameter Bypass Mode (see page 3-5).  
When Bypass Mode is set to Dry, the unit sends only dry,  
unprocessed audio to the outputs. When set to Full  
Mute, the unit mutes the outputs. When set to Input  
Mute, the unit mutes the inputs only. Running effects  
will continue their natural decay.  
Audio tap is a must for live performances. It offers a  
simple method of setting delay times and modulation  
rates to match the music.  
GLOBAL TEMPO  
The Tap/Cancel button LED will flash when a tempo-  
controlled program is loaded. Most factory presets are  
stored with individual tempo rates, which can be  
customized to suit personal taste. Tap in the new tempo,  
then store the modified version of the program in the  
User Bank.  
Bypass functions can also be activated with a footswitch  
(see page 1-10) or MIDI control device (see page 6-4).  
To recall the tempo rate stored with each program, set  
the System Mode parameter Tempo Mode (see page 3-5)  
to Program. The unit will apply the individual tempo  
setting of each program as it is loaded. To apply the  
current tempo rate to all programs, set the System Mode  
2-7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
3
System Mode  
System Mode Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
Parameters • MIDI Dumps • Restore Default Commands  
Download from Www.Somanuals.com. All Manuals Search And Download.  
System Mode  
Lexicon  
Parameter  
Settings  
SYSTEM MODE FUNCTIONS  
Output Level  
0dB* to -31dB  
Off  
System Mode can be used to set System Mode  
parameters, execute MIDI Dumps, and restore  
default settings. To enter System Mode, press  
the front panel System button. The System LED will light  
to indicate that System Mode is active.  
Input Source  
Clock Source  
Analog Stereo*  
Analog Mono L,  
Analog Mono R  
S/PDIF Digital  
Internal 44.1kHz*  
Internal 48kHz  
External (S/PDIF)  
The tables that begin at the right show System Mode  
functions. EDIT knob 1 selects the desired function, and  
EDIT knob 3 changes the parameter setting (if  
applicable). Changes to System Mode parameters are  
effective immediately. MIDI Dumps and Restore Default  
Commands require confirmation to execute.  
Digital Output  
Mix Mode  
Processed*  
Dry  
Program*  
Global  
To exit System Mode, press the System button again.  
Detailed descriptions of all System Mode functions begin  
on page 3-4.  
Bypass Mode  
Dry*  
Full Mute  
Input Mute  
Program Load Mode  
Tempo Mode  
Bypass Dry*  
Full Mute  
Program*  
Global  
Compressor Mode  
Program*  
Global  
3-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
System Mode  
MPX 550  
Parameter  
Settings  
(continued)  
MIDI Dumps  
Settings (if applicable)  
MIDI Patches  
Enabled*  
Disabled  
Dump User Bank  
1-16  
17-32  
33-48  
49-64  
MIDI Channel  
Off  
1* to 16  
Omni  
Dump Current Program  
Dump System Data  
–
–
MIDI Program Change  
Enabled*  
Disabled  
R1-MPX1  
Restore Default Commands  
Clear User Bank  
MIDI Clock In  
Enabled*  
Disabled  
Factory Init  
MIDI Out/Thru  
Operating Mode  
Out*  
Thru  
Normal*  
Demo  
Locked  
Memory Protect  
Auto Load  
Enabled  
Disabled*  
Enabled  
Disabled*  
Display Brightness  
–
*
Indicates default setting  
3-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
System Mode  
Lexicon  
When set to S/PDIF Digital, the unit processes signals  
from the S/PDIF IN connector. If no valid digital audio  
signal is present, the unit will mute and an alert message  
will appear on the front panel display.  
PARAMETERS  
Output Level  
(0 to -31dB, Off)  
Sets output level attenuation within a 0 to -31dB range,  
or off.  
Note:  
When the Input Source parameter is set to S/PDIF  
Digital, the Clock Source parameter will  
automatically be set to External (S/PDIF).  
Input Source  
(Analog Stereo; Analog Mono L and R; S/PDIF Digital)  
Selects input type. The current selection is indicated in  
the lower-left corner of the front panel display. "S" stands  
for Analog Stereo, "L" stands for Analog Mono L, "R"  
stands for Analog Mono R, and "D" stands for S/PDIF  
digital. The number following the prefix indicates the  
sample rate (48 or 44.1kHz). "NoD" indicates that no  
valid digital audio signal is present.  
Clock Source  
(Internal 44.1kHz and 48kHz, External (S/PDIF))  
Selects the internal or external clock source for the unit.  
When set to Internal 44.1kHz, the unit utilizes an internal  
clock with a 44.1kHz sample rate. When set to Internal  
48kHz, the unit utilizes an internal clock with a 48kHz  
sample rate. When set to External (S/PDIF), the unit  
utilizes the S/PDIF input signal, even if an analog source  
is used. "NoD" will appear in the lower-left corner of the  
front panel display if no valid digital input signal is  
present to utilize for the external clock.  
When set to Analog Stereo, the unit processes signals  
from both analog inputs. When set to Analog Mono L,  
the unit sends signals from the ANALOG INPUT labelled  
LEFT to both processor inputs. When set to Analog Mono  
R, the unit sends signals from the ANALOG INPUT  
labelled RIGHT to both processor inputs.  
3-4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
System Mode  
MPX 550  
Digital Output  
(Processed, Dry)  
Program Load Mode  
(Bypass Dry, Full Mute)  
Selects the source for the digital output. When set to  
Processed, the digital output is the same as the analog  
outputs. Its mix level will reflect the current setting of the  
Mix parameter. When set to Dry, the digital output is the  
input. This setting is useful for recording dry tracks while  
still providing processing at the analog outputs.  
Controls the processing of incoming audio signals during  
program load. When set to Bypass Dry, the unit sends  
only dry, unprocessed audio to the outputs. When set to  
Full Mute, the unit mutes during program load.  
Tempo Mode  
(Program, Global)  
Controls the tempo setting that is applied when a new  
program is loaded. A tempo setting is stored with each  
program. When Tempo Mode is set to Program, the unit  
applies the stored tempo setting of each program as it is  
loaded. When set to Global, the unit applies the current  
tempo setting to each program as it is loaded.  
Mix Mode  
(Program, Global)  
Controls the mix level that is applied when a new  
program is loaded. Mix levels are stored with each  
program. When Mix Mode is set to Program, the unit  
applies the stored mix level of the selected program to  
that program as it is loaded. When set to Global, the unit  
ignores stored mix levels and applies the current mix  
level to each program as it is loaded.  
Compressor Mode  
(Program, Global)  
Controls the compression settings that are applied when  
a new program is loaded. Compression settings are  
stored with each program. When Compressor Mode is  
set to Program, the unit applies the stored setting of  
each program as it is loaded. When set to Global, the  
unit applies the current compression setting to each  
program as it is loaded.  
Bypass Mode  
(Dry, Full Mute, Input Mute)  
Sets the function of Bypass. When set to Dry, the unit  
sends only dry, unprocessed audio to the outputs. When  
set to Full Mute, the unit mutes the outputs. When set to  
Input Mute, the unit mutes the inputs only. Running  
effects will continue their natural decay.  
3-5  
Download from Www.Somanuals.com. All Manuals Search And Download.  
System Mode  
Lexicon  
MIDI Patches  
(Enabled, Disabled)  
MIDI Clock In  
(Enabled, Disabled)  
Enables and disables Learned Patches. When set to  
Enabled, the unit responds to Learned Patches. When set  
to Disabled, the unit ignores Learned Patches,  
preventing accidental changes.  
Enables and disables MIDI Clock messages. When set to  
Enabled, Tap Tempo is changed by incoming MIDI  
messages. When set to Disabled, the unit ignores MIDI  
Clock messages, preventing accidental changes.  
MIDI Channel  
(Off, 1 to 16, Omni)  
MIDI Out/Thru  
(Out, Thru)  
Selects the MIDI Channel for MPX 550 messages. When  
set to Off, the unit ignores messages sent on all MIDI  
channels. When set within a range of 1 to 16, the unit  
responds to messages sent on the selected MIDI channel.  
When set to Omni, the unit responds to messages sent  
on all MIDI channels.  
Controls the function of the MIDI OUT/THRU connector.  
When set to Out, the unit can generate its own MIDI  
Dumps. When set to Thru, the unit can forward - but  
cannot generate or modify - MIDI messages.  
Operating Mode  
(Normal, Demo, Locked)  
Controls front panel knobs and buttons. When set to  
Normal, front panel controls perform their normal  
functions. When set to Demo, front panel controls are  
placed in a continuous program load cycle for  
demonstration purposes. When set to Locked, front  
panel controls are locked to their current settings. When  
front panel controls are locked:  
MIDI Program Change (Enabled, Disabled, R1-MPX 1)  
Enables and disables MIDI Program Change messages.  
When set to Enabled, the unit responds to MIDI Program  
Change messages. When set to Disabled, the unit  
ignores MIDI Program Change messages, preventing  
accidental changes. When set to R1-MPX 1, the unit  
responds to program change messages from a Lexicon  
MPX R1 Foot Controller set to MPX 1 Mode.  
3-6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
System Mode  
MPX 550  
•
The front panel PROGRAM knob is still available for  
Auto Load  
(Enabled, Disabled)  
selecting user programs only. Programs stored in the  
User Bank are still available, but cannot be modified.  
Determines whether the front panel Load button must  
be pressed to load selected programs. When set to  
Enabled, programs will automatically load 3/4 second  
after the PROGRAM knob stops turning. When set to  
Disabled, programs will not load until the Load button is  
pressed.  
•
The System Mode parameter Auto Load is set to  
Enabled.  
•
•
•
Bypass functions are still available.  
Tempo and Patches cannot be learned.  
System Mode can still be activated.  
Display Brightness  
Controls the brightness of the front panel display. Turn  
EDIT knob 3 clockwise to make the display darker, and  
counterclockwise to make the display brighter.  
Changes to the Operating Mode parameter will not take  
effect until the unit has been powered off, then powered  
on again.  
Memory Protect  
(Enabled, Disabled)  
Protects the User Bank from accidental changes. When  
set to Enabled, the unit prevents changes to the User  
Bank. However, it does not prevent changes to System  
Mode parameters, nor does it prevent the restoration of  
factory-default settings. Restoring default settings will  
still erase all programs stored in the User Bank. When set  
to Disabled, the unit does not prevent changes to the  
User Bank.  
3-7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
System Mode  
Lexicon  
Dump System Data  
MIDI DUMPS  
Executes a MIDI Dump of all System Mode settings and  
Learned Patches. Press the front panel Store button to  
execute the dump. When dumped back, the System  
Mode settings and Learned Patches will take effect  
immediately.  
Dump User Bank  
(1-16, 17-32, 33-48, 49-64)  
Executes a MIDI Dump of User Bank programs to an  
external MIDI device, such as a sequencer. These  
programs can be dumped back to the unit. This is useful  
to preserve User Bank programs from deletion prior to  
restoring default settings. User programs are dumped in  
groups of 16, depending on the group selected by EDIT  
knob 3. Once a group is selected, press the front panel  
Store button to execute the Dump. When dumped back,  
the group will be returned to its original User Bank  
location.  
Dump Current Program  
Executes a MIDI Dump of the currently active program.  
This allows programs to be saved to an external MIDI  
device. Press the front panel Store button to execute the  
dump. When dumped back, the program will  
automatically become the currently active program.  
3-8  
Download from Www.Somanuals.com. All Manuals Search And Download.  
System Mode  
MPX 550  
RESTORE DEFAULT COMMANDS  
Clear User Bank  
Arms a procedure to erase the contents of the User Bank.  
Press the front panel Store button to execute this  
procedure and return the User Bank to its factory-default  
condition. This procedure cannot be executed when a  
User program is running or when the System Mode  
parameter Memory Protect is set to Enabled.  
Factory Init  
Arms a procedure to restore parameters, System Mode  
parameters, User Bank programs, and Learned Patches to  
their factory-default conditions. Press the front panel  
Store button to execute this procedure.  
3-9  
Download from Www.Somanuals.com. All Manuals Search And Download.  
4
Program Descriptions  
Single Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2  
Plate • Gate/Inv • Hall • Chamber • Ambience • Room • Tremolo • Rotary •  
Chorus • Flange • Detune • Pitch • Dly/Eko  
Special FX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16  
Stereo Stage  
Dual Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18  
Efx Bal • Flng-Dly • Pch-Dly • Chor-Dly • Dly-Rvb • Flng-Rvb • Pch-Rvb •  
Chor-Rvb • MSplit Dly • MSplit Rvb • Dual Mono  
Cmprssr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31  
Dynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32  
Peak Expansion • Compression • Tape Saturation • Level Meters • Typical  
Mastering Dynamics Control Adjustment  
Live-FOH (Front of House) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
Plate Programs  
"Adjust"  
Tap  
SINGLE PROGRAMS  
1
2
3
4
5
6
7
8
9
Small Plate  
Medium Plate  
Large Plate  
Tap PreDelay  
Tape Slap  
(Livenes)  
–
PLATE  
(Livenes)  
(Livenes)  
(MidRT)  
(ips)  
–
Plate reverb began with a large, thin sheet of metal  
suspended upright under tension on springs.  
Transducers attached to the plate transmitted a signal  
that made the plate vibrate, causing sounds broadcast  
through it to appear to be occurring in a large, open  
space.  
–
PreDelay  
(1/32 Note)  
–
The Plate programs synthesize the sound of metal plates  
with high initial diffusion and a relatively bright, colored  
sound. These programs are designed to be heard as part  
of the music, mellowing and thickening the sound. Plate  
programs are a popular choice for enhancing pop music,  
particularly percussion.  
Rich Plate  
(MidRT)  
(MidRT)  
(Livenes)  
(Livenes)  
–
Large&Bright  
VocalPlate  
–
Echo  
–
Drum Plate  
4-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
Gate/Inv Programs  
"Adjust"  
Tap  
GATE/INV  
10 StraightGate  
(Time)  
–
Gated reverbs were created by feeding a reverb, such as  
a metal plate, through an analog gate device. Decay  
time was set to instant, while hold time varied duration  
and sound.  
11 Slope Down  
12 Drum Gate  
13 140ms,TapPre  
14 240ms,TapPre  
15 340ms,TapPre  
16 440ms,TapPre  
17 540ms,TapPre  
18 Inverse  
(Time)  
–
(HighCut)  
(HighCut)  
(HighCut)  
(HighCut)  
(HighCut)  
(HighCut)  
(Time)  
PreDelay  
(1/32 Note)  
The Gate programs provide a fairly constant sound with  
no decay until the reverb is cut off abruptly. These  
programs work well on percussion, particularly on snare  
and toms. It is recommended to experiment with other  
sound sources as well.  
PreDelay  
(1/32 Note)  
PreDelay  
(1/32 Note)  
PreDelay  
(1/32 Note)  
Note:  
PreDelay  
(1/32 Note)  
Adjusting the Time or Duration parameters will  
cause the selected program to reload. The System  
Mode parameter Program Load Mode determines  
whether the system will mute or bypass during  
program load.  
PreDelay  
(1/32 Note)  
–
19 Dark Inverse  
(Time)  
–
4-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
Hall Programs  
"Adjust"  
Tap  
HALL  
20 Small Hall  
(MidRT)  
–
Lexicon’s Hall programs recreate the acoustics of actual  
places - from grand, reverberant enclosures to small  
concert halls.  
21 Medium Hall  
22 Large Hall  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
–
–
–
–
–
–
–
–
–
The clean reverberation of Hall programs is designed to  
add spaciousness without altering source material. In  
addition to general instrumental and vocal applications,  
the Hall programs give separately recorded tracks a sense  
of belonging to the same performance.  
23 Small Church  
24 Large Church  
25 Jazz Hall  
26 Dance Hall  
27 Synth Hall  
28 Concert Hall  
29 Gothic Hall  
4-4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
Chamber Programs  
"Adjust"  
Tap  
CHAMBER  
30 Brick Wall  
(HighCut)  
–
Historically, recording studio chambers were oddly  
shaped rooms with a loudspeaker and set of  
microphones to collect ambience in various parts of the  
room.  
31 Basement  
(HighCut)  
(Livenes)  
(MidRT)  
(Livenes)  
(Livenes)  
(Livenes)  
(Livenes)  
(Livenes)  
(MidRT)  
–
32 LiveConcert  
Eko Delay  
Stereo Chamber programs produce even, relatively  
dimensionless reverberation with little color change as  
sound decays. The initial diffusion is similar to Hall  
programs. However, the sense of size and space is much  
less obvious. This characteristic, coupled with the low  
color of the decay tail, makes these programs useful on  
a wide range of material - especially the spoken voice.  
Chamber programs give the spoken voice a noticeable  
increase in loudness with low color.  
33 Drum Chamber  
34 Moves on . . .  
35 Live Chamber  
36 VocalChambr1  
37 VocalChambr2  
38 WideChamber  
39 PCM60: Large  
–
–
–
Eko Delay  
Eko Delay  
4-5  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
Ambience Programs  
"Adjust"  
Tap  
AMBIENCE  
40 Announcer  
(HighCut)  
–
Ambience adds warmth, spaciousness, and depth to a  
performance without coloring its direct sound. It is  
commonly used to add a room sound to recorded music  
and speech. In music recording, Ambience can  
realistically add distance to close-mic’ed signals.  
41 VerySmallAmb  
42 Small Amb  
43 MidSizeAmb  
44 Studio "D"  
(HighCut)  
(HighCut)  
(HighCut)  
(HighCut)  
(Decay)  
–
–
–
–
–
–
–
–
–
Ambience programs simulate reflections from room  
surfaces with random reflections, a gradual decay of  
overall level, and a gradual narrowing of bandwidth. In  
these programs, the Mix control adds depth - emulating  
the movement of a coincident pair of microphones away  
from the sound source into the room.  
45 Bright Amb  
46 Dark Amb  
(Decay)  
47 MarbleFoyer  
48 Smooth Amb  
49 Guitar Amb  
(Livenes)  
(Decay)  
(HighCut)  
4-6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
Room Programs  
"Adjust"  
Tap  
ROOM  
50 Bedroom  
(Walls)  
–
Room programs simulate actual rooms where there is a  
strong sense of being in a small, live place. These  
programs are useful on drums and percussion, and can  
also be applied to electric guitar tracks.  
51 Tiled Room  
52 Studio "C"  
53 Small Room  
54 Studio "B"  
55 Rehearsal Rm  
56 Studio "A"  
57 Large Room  
58 Fat Space  
(LFBoost)  
(MidRT)  
(Livenes)  
(MidRT)  
(EQ)  
–
–
–
–
–
–
–
–
–
(MidRT)  
(EQ)  
(MidRT)  
(EQ)  
59 Chunky Space  
4-7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
Set the Mix parameter to Wet for all programs. Mix can  
be used to effectively set the depth of the Tremolo  
program when more dry is added to the wet-to-dry mix.  
It is recommended to make the rate work with the  
tempo of the music, as Tremolo is essentially a rhythmic  
effect.  
TREMOLO  
Tremolo is a rhythmic change in loudness, commonly  
employed as an expressive technique by vocalists and  
wind instrument players. It is also one of the oldest  
effects, frequently used with electric guitar, electric  
piano, and occasionally vocals. Different tremolo effects  
are largely determined by the rate (fast or slow) and  
waveform shape (smooth or sharp) of the change in  
loudness. If the effect is used in a stereo mix, the left and  
right can be synchronized to produce dramatic side-to-  
side motion.  
Tremolo Programs  
"Adjust"  
Tap  
60 RectSine Tap  
(Phase)  
Rate  
(1/8 Note)  
61 Square Tap  
62 Sine TapTrpl  
63 Triangle  
(Phase)  
(Phase)  
(Phase)  
(Phase)  
Rate  
(1/8 Note)  
The Tremolo programs offer classic tremolo shapes, such  
as square, sawtooth, triangle, sine, and rectified sine. The  
synchronization of the left and right channels can be  
adjusted to produce mono and stereo effects. The Tap  
button sets tremolo rates, making it simple to match the  
tempo of the music. The "Adjust" parameter (Phase) sets  
left and right channel waveforms out-of-phase, resulting  
in a panning motion.  
Rate  
(1/4 Note)  
–
–
64 Sawtooth  
4-8  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
A virtual requirement for organ music, Rotary programs  
also sound remarkable with guitar and electric piano  
rhythm parts. In fact, these programs are great  
alternatives to chorus and tremolo effects for any sound  
source.  
ROTARY  
Rotary speaker cabinets were designed to provide a  
majestic vibrato/choir effect for electronic theater and  
church organs. The most well-known rotary speaker is  
the Leslie™ Model 122, which has two counter-rotating  
elements: a high-frequency horn and a low-frequency  
drum with slow and fast speeds. The sound generated as  
the spinning elements change speed is truly magical.  
The swirling, spacious effect is difficult to describe - but  
immediately recognizable.  
To achieve the full effect, set the Mix parameter to Wet  
for all programs.  
Rotary Programs  
"Adjust"  
Tap  
65 Rot:SlowFast  
(Switch)  
–
The Rotary programs are a detailed simulation of a Leslie-  
style cabinet. The input signal is split into high and  
low-frequency bands. The rotation effect is created by a  
synchronized combination of pitch shifting, tremolo,  
and panning. Like the physical cabinet, the high (horn)  
and low (drum) frequencies are "spun" in opposite  
directions. Horn and drum speeds are independent, and  
designed with acceleration and deceleration  
characteristics to simulate the inertia of the original  
mechanical elements.  
66 Rot Slow  
(Resnce)  
(Speed)  
(Balance)  
(Resnce)  
–
67 Rot SpeedAdj  
68 Rot TapRate1  
69 Rot TapRate2  
–
Rate  
Rate  
4-9  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
Chorus Programs  
"Adjust"  
Tap  
CHORUS  
70 Chorus1  
(Resnce)  
–
Chorus effects create lush, full sounds by multiplying the  
original audio source. Traditionally, these effects were  
used to fatten up tracks and to add body to guitar  
without coloring the original tone. Chorus effects are  
also often combined with plates, echoes, and other  
reverb effects.  
71 Chorus2  
(HighCut)  
(Diffusn)  
(Diffusn)  
(Depth)  
–
–
–
–
72 Chorus3  
73 Slap Chorus1  
74 Slap Chorus2  
The stereo Chorus programs, inherited from Lexicon’s  
PCM 80, create a rich, airy effect that simulates the  
sound of multiple sources from a single source. These  
programs are stunning on acoustic or clean electric  
guitar.  
These programs utilize six independently randomized  
delay voices panned across the stereo field. Set the Mix  
parameter to Wet to achieve the full richness of the  
6-voice chorus.  
4-10  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
Flange Programs  
"Adjust"  
Tap  
FLANGE  
75 Flng Lite  
(Rate)  
–
Flange effects were originally created by simultaneously  
playing back identical programs on two tape recorders,  
then using hand pressure against the flange of the tape  
reels to slow down first one machine, then the other. The  
result was a series of changing phase cancellations and  
reinforcements, with characteristic swishing, tunneling,  
and fading sounds.  
76 Flng Lite180  
77 Flng Med180  
78 Flng Deep  
(Resnce)  
(Rate)  
–
–
–
–
(Resnce)  
(Resnce)  
The stereo flanger has two 2-Tap delays - one per  
channel. The first tap is fixed, and the second sweeps  
past it. Mixing the two delay taps together creates the  
flanging effect.  
79 Flng Deep180  
Set the Mix parameter to Wet to achieve the full flange  
effect of these programs.  
4-11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
Detune Programs  
"Adjust"  
Tap  
DETUNE  
80 Detune Mild  
(Dtuning)  
–
Detune effects create delayed and pitch-shifted versions  
of the original source, thickening the sound. This creates  
a particularly effective simulation of double-tracking.  
These effects are also great alternatives to Chorus effects,  
adding the richness of a chorus without the audible  
sweep caused by the chorus rate.  
81 Detune  
Med&Warm  
(Dtuning)  
(Dtuning)  
(Dtuning)  
(Dtuning)  
–
–
–
–
82 Detune Heavy  
83 Det Xtreme  
84 Pitch Detune  
The 4-voice stereo Detune programs have one pair of  
voices per channel. As more detune is applied with the  
"Adjust" parameter, the pair become more out of tune,  
providing a lush sound without the need for mixing in a  
dry signal.  
Set the Mix parameter to Wet to achieve the full effect of  
these programs.  
4-12  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
Pitch Programs  
"Adjust"  
Tap  
PITCH  
85 Pch Chrmatic  
(Pitch)  
–
Altering the pitch of a sound produces a wide range of  
effects - from subtle detuning, to harmonies, to chords.  
The stereo polyphonic Pitch programs can be used to  
shift program material or monophonic sources within a  
range of one octave up to two octaves down.  
86 Pitch Fine  
(Pitch)  
–
–
–
–
87 Pch 4th-5ths  
88 Pch PowerInv  
89 Vocal Chorus  
(Pitch)  
For pitch correction, set the Mix parameter to Wet. For  
harmonization, set the Mix parameter to the desired  
setting.  
(Inversn)  
(HighCut)  
4-13  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
The DLY/EKO programs include mono (5.5 seconds),  
stereo (2.7 seconds), and 6-voice multi-tap effects. Each  
program can be used for tape or digital delay or echo  
effects. When the "Adjust" parameter (Edit Page 1, EDIT  
knob 1) is set to a value between 0 and 63, digital delay  
effects are produced. Each repeat is the same timbre, but  
softer. When the "Adjust" parameter is set to a value  
between 64 and 127, tape effects are produced. Each  
repeat is darker and softer.  
DLY/EKO  
Delays and echoes repeat a sound a short time after it  
first occurs. The simplest (and oldest) delay effect is tape  
slap - a single repeat about 100ms after the original  
sound. Tape slap was often used on Elvis Presley’s voice  
and rockabilly guitar tracks.  
Tape slap becomes tape echo when the output of the  
tape is fed back into the input (feedback). This turns a  
single repeat into a series of repeats, each a little softer  
and a little darker than the last. This darkening is  
characteristic of the analog tape recording process.  
In programs 90 to 97, the "Adjust"  
MIN  
parameter sets the amount of  
Delays  
Echoes  
feedback with an increasing number  
of repeats as the setting is increased.  
Delay time is set with Tap. Each  
MAX  
MAX  
Digital echoes do not have this characteristic; each  
repeat has the same exact timbre. For digital echoes,  
loudness is the only difference from repeat to repeat.  
program is preset with a different useful rhythm. In  
programs 98 to 104, the amount of feedback is preset  
and the "Adjust" parameter determines the delay time.  
Tape and digital echoes are both useful, but different.  
Tape echo is warmer, allowing the original sound to  
distinguish itself. Digital echo presents a "perfect" copy  
of the original sound.  
With all delay and echo effects, note the way the repeats  
fall rhythmically to the beat. The most effective delay  
and echo patterns are those that lock with the tempo of  
the music.  
4-14  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
In all delay programs and dual programs, the unit uses  
the MstrDly parameter to scale delay times that are not  
controlled by Tempo. In some programs, the "Adjust"  
parameter controls MstrDly.  
Dly/Eko Programs  
"Adjust"  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(Time)  
Tap  
90  
91  
92  
93  
94  
95  
96  
97  
98  
99  
Dly Mono Tap  
DlyStereoTap  
Dly ShuflTap  
Dly Dot8 Tap  
Dly 8+3plTap  
Dly Pong Tap  
Dly XFbkTap1  
Dly XFbkTap2  
Dly Mono  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
MstrDly can be set within a range of 0 to 100%. It is  
usually set to 100% in most presets. When MstrDly is set  
manually (or by the "Adjust" parameter) to less than  
100%, individual delay times will scale accordingly. For  
example, if MstrDly is set to 25%, all delay times will be  
reduced to 1/4 of their normal value. Knobs that control  
those delay times will become correspondingly less  
sensitive - requiring, in this example, four times as many  
clicks to obtain the normal result.  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
–
–
–
–
–
–
–
Dly Stereo  
(Time)  
100 Dly TapeSlap  
101 Multi Bounce  
102 MultiInverse  
103 Multi Linear  
104 Multi Pong  
(Time)  
(Time)  
(Time)  
(Time)  
(Time)  
4-15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
SPECIAL FX  
Special FX Programs  
105 Infinite  
"Adjust"  
(HighCut)  
(Dtuning)  
(Resnce)  
(HighCut)  
(Time)  
Tap  
Eko  
106 The Abyss  
–
107 Jet Flange  
Speed (Whole Note)  
108 Verb>Chorus  
109 TapRot Dly  
110 Fader Verb  
111 Low Rumble  
112 Ducker Verb  
113 DuckerChorus  
114 Stereo Stage  
115 Echoes:Beats  
116 Panning Dlys  
117 DreamSequenc  
118 Infinite Dly  
119 Diffusor  
–
Rate (Drum/Horn)  
(Level)  
Echo  
(Decay)  
(Decay)  
(Resnce)  
(Width)  
(Delay)  
–
–
–
–
Delay Time  
(FeedBk)  
(Pitch)  
Dly Time, Pan Rate  
–
(FeedBk)  
(Diffusn)  
Delay Time (Whole Note)  
–
4-16  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
•
The ideal setting for the Width parameter depends  
on the distance between the speakers at each side of  
the stage. The program loads with an assumed  
spacing of about 20 feet, with an adjustment range  
of 10 to 50 feet. The width setting assumes that  
most audience members are seated within about 30  
degrees to either side of the stage centerline. If  
audience members are seated further to the sides of  
the stage, the setting can be increased. Otherwise, it  
should be kept as low as possible.  
STEREO STAGE  
Stereo Stage provides stereo reverb while preserving the  
dry signal. To use this program, note the following:  
•
Use the MPX 550 in line between the mixer and  
house amplifiers - not as an effect mixed back into  
the main left and right channels on the mixer.  
•
•
•
Pan the input channels on the mixer fully to each  
musician’s side of the stage.  
Keep the Mix parameter set to 50% (the default  
Program Load Mode setting).  
Adjust reverb level by setting the Efx Bal parameter  
between 100:0% (full left) and 60:40%.  
4-17  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
•
MSplit Dly, MSplit Rvb  
DUAL PROGRAMS  
These banks contain programs that are arranged in  
Mono Split configuration, which is similar to the  
Dual Stereo (Parallel) configuration. One effect (e.g.  
Flange) receives signals from the left input and the  
other effect (e.g. Delay) receives signals from the  
right input. However, both effects send signals to the  
left and right outputs.  
The dual programs combine Delay with Reverb, or either  
Delay or Reverb with Flange, Pitch, or Chorus. Four  
routing configurations are used in the variations of each  
dual program: Dual Stereo (Parallel), Cascade, Mono  
Split, and Dual Mono.  
•
Flng-Dly, Pch-Dly, Chor-Dly, Dly-Rvb, Flng-Rvb,  
Pch-Rvb, and Chor-Rvb  
•
Dual Mono  
The first six programs in these banks feature two effects  
arranged in Dual Stereo (Parallel) configuration. Both  
effects receive signals from the left and right inputs,  
and both effects send signals to the left and right  
outputs. The last four programs in these banks feature  
two effects arranged in Cascade configuration. The  
first effect passes its signal to the second effect. For  
example, in Flng-Dly, Flange passes its signal to Delay.  
This bank contains programs that are arranged in the  
Dual Mono configuration. One effect (e.g. Flange)  
receives input from the left channel only and sends  
output to the left channel only. The other effect (e.g.  
Delay) receives input from the right channel only  
and sends output to the right channel only.  
Cascade  
Dual Mono  
Dual Stereo (Parallel)  
Mono Split  
L
L
L
L
L
L
L
L
Flange  
Delay  
Flange  
Delay  
Flange  
Delay  
Flange  
Delay  
R
R
R
R
R
R
R
R
4-18  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
EFX BAL  
The illustration below uses the Pch-Dly program to show  
the effect of the Efx Bal parameter at certain settings  
when a Cascade variation is selected.  
The Efx Bal parameter controls the relative balance of  
each effect in the dual programs. In Cascade variations,  
the parameter also varies the amount of the first effect or  
dry signal fed into the second effect.  
50:50%: Provides delayed pitch shift.  
Pitch  
Delay  
25:75%:  
75:25%:  
Provides delayed pitch shift, plus delayed dry signal.  
Provides pitch shift, plus delayed pitch shift.  
Pitch  
Delay  
Pitch  
Delay  
0:100%: Provides delayed dry signal.  
100:0%: Provides pitch shift.  
Pitch  
Pitch  
Delay  
Delay  
4-19  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
FLNG-DLY  
Flng-Dly Programs  
120 Flng Tap  
"Adjust"  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(Time)  
Tap  
Routing  
Delay Time (1/4 Note)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Cascade  
121 Flng .8Tap  
122 Flng 3plTap  
123 Flng PongTap  
124 Flng Xfeed  
125 Flng Bounce  
126 Flng > Tap  
127 Flng > Fbk  
128 Flng > Pong  
129 Flng > Bnce  
Dotted (1/8 Note)  
Triplet (1/8 Note)  
Delay Time (1/4 Note)  
–
(Time)  
–
(FeedBk)  
(Time)  
Delay Time (1/4 Note)  
–
Cascade  
(FeedBk)  
(Time)  
Delay Time (1/4 Note)  
–
Cascade  
Cascade  
Cascade  
Dual Stereo (Parallel)  
L
L
L
L
Flange  
Delay  
Flange  
Delay  
R
R
R
R
4-20  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
PCH-DLY  
Pch-Dly Programs  
130 5th Tap  
"Adjust"  
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
Tap  
Routing  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Cascade  
131 8ve 3pl Tap  
132 8ve 8+3plTap  
133 3rd4thPong  
134 4th5th Xfeed  
135 5th6th Xfeed  
136 8ve > Xfeed  
137 5th > Xfeed  
138 MajMin > Fbk  
139 StepUp > Tap  
Cascade  
Cascade  
Cascade  
Cascade  
Dual Stereo (Parallel)  
L
L
L
L
Pitch  
Delay  
Pitch  
Delay  
R
R
R
R
4-21  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
CHOR-DLY  
Chor-Dly Programs  
140 Chor Tap  
"Adjust"  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(FeedBk)  
(Time)  
Tap  
Routing  
Delay Time  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Cascade  
141 Chor .8Tap  
142 Chor 8+3pl  
143 Chor Pong  
144 Chor Repeat  
145 Chor Bounce  
146 Chor > Tap  
147 Chor >Repeat  
148 Chor > Pong  
149 Chor > Bnce  
Delay Time  
Delay Time  
Delay Time  
–
(Time)  
–
(FeedBk)  
(Time)  
Delay Time  
–
Cascade  
(FeedBk)  
(Time)  
Delay Time  
–
Cascade  
Cascade  
Cascade  
Dual Stereo (Parallel)  
L
L
L
L
Chorus  
Delay  
Chorus  
Delay  
R
R
R
R
4-22  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
DLY-RVB  
Dly-Rvb Programs  
150 Tap Small  
"Adjust"  
(MidRT)  
(MidRT)  
(MidRT)  
(Decay)  
(Decay)  
(Decay)  
(Livenes)  
(MidRT)  
(Livenes)  
(MidRT)  
Tap  
Routing  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Cascade  
151 3plTap MidSz  
152 8+3pl Large  
153 Pong Small  
154 Xfeed MidSz  
155 Xfeed Large  
156 Tap > Room  
157 8+3pl >Large  
158 Xfeed > Room  
159 Xfeed >Large  
Cascade  
Cascade  
Cascade  
Cascade  
Dual Stereo (Parallel)  
L
L
L
L
Delay  
Delay  
Reverb  
R
R
R
R
Reverb  
4-23  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
FLNG-RVB  
Flng-Rvb Programs  
160 LiteFl Small  
161 LiteFl MidSz  
162 LiteFl Large  
163 DeepFl Small  
164 DeepFl MidSz  
165 DeepFl Large  
166 LiteFl>Small  
167 LiteFl >Room  
168 DeepFl>Large  
169 DeepFl >Room  
"Adjust"  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(Livenes)  
(MidRT)  
(Livenes)  
Tap  
Routing  
Speed (Whole Note)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Cascade  
Speed (Whole Note)  
–
–
–
–
Speed (Whole Note)  
Speed (Whole Note)  
Cascade  
–
–
Cascade  
Cascade  
Dual Stereo (Parallel)  
Cascade  
L
L
L
L
Flange  
Reverb  
Flange  
Reverb  
R
R
R
R
4-24  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
PCH-RVB  
Pch-Rvb Programs  
170 3rd4th Room  
171 4th5th Room  
172 5th6th Room  
173 8ve MidSiz  
"Adjust"  
(Pitch)  
Tap  
–
Routing  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Cascade  
(Pitch)  
–
(Pitch)  
–
(Pitch)  
–
174 Power MidSiz  
175 Detune Room  
176 Fine > Small  
177 Power >Large  
178 4th > MidSiz  
179 8ve > MidSz  
(MidRT)  
(Dtuning)  
(Pitch)  
–
–
–
(MidRT)  
(MidRT)  
(MidRT)  
–
Cascade  
–
Cascade  
–
Cascade  
Cascade  
Dual Stereo (Parallel)  
L
L
L
L
Pitch  
Pitch  
Reverb  
R
R
R
R
Reverb  
4-25  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
CHOR-RVB  
Chor-Rvb Programs  
180 Chor1 Small  
181 Chor1 MidSiz  
182 Chor1 Large  
183 Chor2 Small  
184 Chor2 MidSiz  
185 Chor2 Large  
186 Chor1 > Room  
187 Chor2 > Room  
188 Chor3 > Room  
189 Chor1 >Small  
"Adjust"  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(Livenes)  
(Livenes)  
(Livenes)  
(MidRT)  
Tap  
–
Routing  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Dual Stereo (Parallel)  
Cascade  
–
–
–
–
–
–
–
Cascade  
–
Cascade  
–
Cascade  
Cascade  
Dual Stereo (Parallel)  
L
L
L
L
Chorus  
Reverb  
Chorus  
Reverb  
R
R
R
R
4-26  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
MSPLIT DLY  
MSplit Dly Programs  
190 Flng + Tap  
"Adjust"  
(FeedBk)  
(FeedBk)  
(Time)  
Tap  
Routing  
1/4 Note  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
191 Flng + Pong  
192 Flng + Xfeed  
193 Flng + Bnce  
194 DeepFl + Dly  
195 5th + Tap  
1/4 Note  
–
(Time)  
–
(Time)  
–
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
(Pitch)  
(FeedBk)  
(FeedBk)  
(Time)  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
–
196 8ve + 3plTap  
197 4th5th+Xfeed  
198 5th6th+Xfeed  
199 PchFine +Tap  
200 Chor + Tap  
201 Chor + Pong  
202 Chor + Xfeed  
203 Chor + Bnce  
204 Chor+Inverse  
(Time)  
–
(Time)  
–
Note: The Mono Split routing configuration is illustrated on page 4-18.  
4-27  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
MSPLIT RVB  
MSplit Rvb Programs  
205 Tap + MidSiz  
206 Pong + Large  
207 Bnce + MidSz  
208 Xfeed + Small  
209 Xfeed+MidSiz  
210 LiteFl+MidSz  
211 LiteFl+Large  
212 DeepFl+Small  
213 DeepFl+MidSz  
214 DeepFl +Room  
215 4th5th +Room  
216 5th6th +Room  
217 4ths + Large  
218 8ve + MidSz  
219 PchFin+MidSz  
220 Chor1 +Small  
"Adjust"  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(Livenes)  
(Pitch)  
Tap  
Routing  
Delay Time  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
Delay Time  
Delay Time  
Delay Time  
Delay Time  
–
–
–
–
–
–
–
–
–
–
–
(Pitch)  
(MidRT)  
(MidRT)  
(Pitch)  
(MidRT)  
4-28  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
MSplit Rvb Programs  
221 Chor1+ Large  
222 Chor2+MidSiz  
223 Chor2+ Large  
224 Chor3+MidSiz  
"Adjust"  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
Tap  
–
Routing  
Mono Split  
Mono Split  
Mono Split  
Mono Split  
–
–
–
Note: The Mono Split routing configuration is illustrated on page 4-18.  
4-29  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
DUAL MONO  
Dual Mono Programs  
225 Tap | Small  
226 Tap | MidSiz  
227 Tap | Large  
228 Tap | Room  
229 DeepFl | Tap  
230 DeepFl | Dot8  
231 8ves | Tap  
"Adjust"  
(MidRT)  
(MidRT)  
(MidRT)  
(Livenes)  
(FeedBk)  
(FeedBk)  
(Pitch)  
Tap  
Routing  
Delay Time  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Dual Mono  
Delay Time  
Delay Time  
Delay Time  
Speed (1/4 Note)  
Speed (Dotted 1/4 Note)  
Delay Time  
232 8ves | 3pl  
(Pitch)  
Delay Time  
233 Chor2 | Tap  
234 Chor2 | Dot8  
235 LiteFl | Large  
236 DeepFl | Large  
237 8ves | MidSz  
238 4ths | Large  
239 Chor1 | Room  
(FeedBk)  
(FeedBk)  
(MidRT)  
(MidRT)  
(MidRT)  
(MidRT)  
(Livenes)  
Delay Time  
Delay Time  
Speed  
–
–
–
–
Note: The Dual Mono routing configuration is illustrated on page 4-18.  
4-30  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
Comprssr Programs  
"Adjust"  
Tap  
CMPRSSR  
240 Two to One  
(Gain)  
–
In all Cmprssr programs, the "Adjust" parameter controls  
gain within a range of 0 to 9.5dB. It can be used to  
match volume levels between the dry, bypassed, and  
compressed output obtained with typical music  
material.  
241 Three to One  
242 3:1 Small  
(Gain)  
(Gain)  
(Gain)  
(Gain)  
(Gain)  
(Gain)  
(Gain)  
(Gain)  
–
PreDelay  
PreDelay  
PreDelay  
–
If the System Mode parameter Mix Mode is set to  
Program, the Mix parameter will automatically be set to  
Wet, allowing the compressed delay signal to be the only  
output signal present. If the System Mode parameter  
Mix Mode is set to Global, the Mix parameter must be  
set manually.  
243 5:1 Medium  
244 3:1 Large  
245 GuitarComp  
246 Limiter  
–
The five compressor-reverb presets offer a reverb  
component in parallel with a zero-delay dry component.  
The compressor acts on both. The Mix parameter should  
be set to Wet, and the effective mix should be adjusted  
with the Efx Bal parameter.  
247 Male Vocal  
248 Female Vocal  
PreDelay  
PreDelay  
*
Presets 240, 241, 245, and 246 are compressor only. Presets 242, 243,  
244, 247, and 248 are combination compressor and reverb with Dual  
Stereo (Parallel) routing.  
4-31  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
DYNAMICS  
PEAK EXPANSION  
Peak expansion is used to raise the overall level of sound  
sources that rise above the adjustable peak expansion  
threshold. In performances with a wide dynamic range,  
peak expansion can increase the level of low-level sound  
sources. For example, for a relatively quiet instrument  
that swells in volume without the desired impact, peak  
expansion can raise the instrument level during the swell.  
Note:  
A few seconds after the Dynamics preset is loaded,  
the Dynamics name will flash briefly on the front  
panel display. This does not affect audio input or  
output.  
Dynamics is intended for use in the studio, when  
dynamic processing of stereo signals is required. Because  
of its long delay, this preset is not recommended for use  
in a live performance or as a mix insert. It includes effects  
that perform peak expansion, compression, and tape  
saturation in that order.  
ExpThrsh  
(-31 to 0dB)  
Controls the threshold above which expansion is  
applied. Lower settings enable low-level sound sources  
to expand. Higher settings enable only very high-level  
peaks to expand.  
ExpLvl  
(0.0dB to 5.89dB)  
Dynamics includes nine parameters that are divided into  
three Edit Pages. Peak expansion settings are controlled  
on the first page, compression settings are controlled on  
the second page, and tape saturation settings are  
controlled on the third page. The first page also features  
a switch that selects between gain reduction and input  
metering.  
Controls the amount of expansion that is applied to  
sound sources that rise above the expansion threshold.  
The parameter setting defines the maximum increase in  
signal level due to expansion. Higher settings increase  
the level of expansion applied. Maximum expansion is  
applied to signals that rise well above the expansion  
threshold for longer than 50ms.  
4-32  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
Meters  
(GR, In)  
Thresh  
(-31 to -0dB)  
Selects between gain reduction (GR) and input level (In)  
metering. (See page 4-35 for more information.)  
Designates the compression threshold, the level the  
sound source must rise above before compression is  
applied.  
COMPRESSION  
Attack  
(200 to 3.0msec)  
Compression is used to lower the overall level of sound  
sources that rise above an adjustable compression  
threshold. Compression can be used to match the levels  
of louder sources to those of quieter sources.  
Determines how fast the compressor responds to sound  
sources that rise above the compression threshold.  
Slower settings allow the signal to rise above the  
threshold for short periods of time with minimal  
compression.  
Ratio  
(1:1 to 10:1)  
Determines the level of gain reduction applied when the  
sound source rises above the compression threshold. It  
can be set in ratios of 1:1, 1.60:1, 2.00:1, 2.66:1, 3.20:1,  
4.00:1, 5.33:1, 8.00:1 and 10:1. For each dB rise in input  
to the compressor, the ratio indicates the fraction of the  
dB rise in output. For example, when Ratio is set to  
4.00:1, the output will rise 0.25dB for each dB rise in  
input to the compressor. Higher settings will result in  
more compression.  
Release  
(4.0 to .30sec)  
Determines how fast compression is reduced when  
sound sources fall below the compression threshold.  
Slower settings reduce compression gradually. Faster  
settings reduce compression more quickly, causing the  
level of the sound source to be tracked more closely.  
. . . continued on page 4-34  
4-33  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
Saturation  
(Off, Modern, Vintage)  
TAPE SATURATION  
Controls the amount of saturation.  
Tape saturation emulates the sound of sources recorded  
on analog tapes and sources recorded digitally. Because  
of the natural peak saturation that occurs with analog  
tapes, sound sources recorded on them seem louder  
than the same sound sources recorded digitally. To use  
this effect, increase the Gain parameter setting. The  
amount of gain used is guided by both the output level  
meter and, more importantly, the ear. Gain levels that  
are too high can dramatically reduce the dynamic range  
of sound sources, possibly causing objectionable  
distortion - just like real tape.  
LEVEL METERS  
1
3
4
2
1
Gain  
(Min, 1 to 30, Max)  
2
Determines average output level. Lower settings prevent  
signal saturation. Higher settings reduce peaks within the  
sound source relative to the average level of the sound  
source, enabling the peak saturation block to reduce  
peak levels. The setting can be increased to its maximum  
level without causing digital overload. However,  
excessive peak saturation may distort the signal.  
1. Output Level Meter  
Indicates output levels. The value indicates the  
maximum output level of the left or right channel,  
whichever is greater. The tick marks are placed in  
3dB increments. The right most tick mark indicates  
0dB or maximum output level.  
4-34  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
2. Peak Expansion Meter  
4. Input Meter  
Indicates the level of peaks above the peak  
expansion threshold. Low-level peaks are shown as  
one or two graduated bars. Slightly higher peaks of  
longer duration are shown as three graduated bars.  
High-level peaks are shown as three solid bars.  
When the Meters parameter is set to In, indicates the  
maximum left or right channel input levels,  
whichever is greater. The associated tick marks are  
placed in 3dB increments. The right-most tick mark  
indicates 0dB or maximum input level.  
Note:  
TYPICAL MASTERING DYNAMICS CONTROL  
ADJUSTMENT  
The following is a common scenario for musical sources  
that have not previously been compressed:  
Use the Meters parameter to select between gain  
reduction and input level metering.  
3. Gain Reduction Meter  
•
•
For analog input sources, adjust the front panel  
Input Trim knob so the input meters peak in the -6dB  
range. The input meters should never exceed the  
0dB level.  
When the Meters parameter is set to GR, indicates  
the output level reduction due to compression. The  
value shown indicates the maximum left or right  
channel gain reduction, whichever is greater.  
Beginning at 0dB, reduce the setting of the ExpThrsh  
parameter until peaks in the source material cause  
the peak expansion level meter to show 1 to 3  
graduated bars. High-level peaks in the sound source  
The meter moves from right to left. The tick marks  
are placed in 3dB increments. The right-most tick  
mark represents 0dB or no gain reduction. Each tick  
mark proceeding from right to left indicates an  
additional 3dB of gain reduction.  
. . . continued on page 4-36  
4-35  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
Lexicon  
Typical Mastering Dynamics Control Adjustment (continued)  
LIVE-FOH (FRONT OF HOUSE)  
Live-FOH programs are designed for live performances,  
with controls that are more convenient for live-sound  
engineers to operate. These programs use Dual Mono  
routings to accommodate the sound reinforcement  
systems (PAs) used in most small-to-mid-sized venues.  
Often, these systems provide limited channels and mono  
aux sends for effects.  
will cause the peak expansion meter to show three  
solid bars for short periods of time. Increase the  
ExpLvl parameter until the peaks in the source  
material sound slightly exaggerated. Then, reduce  
the setting until the peaks sound natural.  
•
Set the Ratio parameter to 4.00:1, the Attack  
parameter to 7.2msec, and the Release parameter to  
1.4sec. Beginning at 0dB, reduce the setting of the  
Thresh parameter until the gain reduction meter  
moves between 0 and 3 to 6dB of gain reduction. If  
the output level sounds unnatural, increase the  
settings of the Attack and Release parameters. If  
output levels are too low after peaks occur, increase  
the setting of the Release parameter. If output levels  
are still too low after peaks occur, increase the  
setting of the ExpLvl parameter.  
For Live-FOH presets:  
•
Edit Page 1 contains the four most essential  
parameters for the first effect, and Edit Page 2  
contains the four most essential parameters for the  
second effect. Non-essential parameters have been  
removed from the Edit Pages.  
•
Beginning at 0, adjust the Gain parameter setting  
until the output level meter shows peaks above  
–3dB.  
4-36  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Program Descriptions  
MPX 550  
• In the delay programs, two delay level controls have  
Live-FOH Programs  
"Adjust"  
Tap  
been combined into the "Adjust" parameter: (Tap/  
Dly). These programs contain two delays. The first is  
controlled by tempo and generally used to create  
longer delays and echoes. The second is set  
manually with the Delay parameter, and can be used  
to create a "slap" of 60 to 135ms.  
250 Flange/Dly  
(Tap/Dly)  
(Tap/Dly)  
(Tap/Dly)  
(Tap/Dly)  
(Tap/Dly)  
(Tap/Dly)  
Delay Time  
251 Chorus/Dly  
252 Flange/Rvb  
253 Chorus/Rvb  
254 Dly/Reverb  
255 Dly/Reverb  
Delay Time  
–
–
The (Tap/Dly) parameter provides an inverse level  
control for these delays. The default setting provides  
equal levels of each. The tempo-controlled delay is  
suited for longer rhythm-sensitive effects, while the  
manually-controlled delay is suited for shorter times.  
However, both delays are capable of delivering a full  
range of delay times that can be crossfed into each  
other for more extreme effects.  
Delay Time  
Delay Time  
•
The Dly/Reverb program is available with alternative  
EDIT knob assignments (255). The first two Edit  
Pages are arranged with delay parameters on the left  
and reverb parameters on the right. This  
arrangement splits effect controls left-to-right rather  
than page-to-page.  
4-37  
Download from Www.Somanuals.com. All Manuals Search And Download.  
5
Parameter Descriptions  
Parameter Graphics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2  
Parameter Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
Lexicon  
PARAMETER GRAPHICS  
The MPX 550 features graphic enhancements for each parameter, which appear on the front panel display whenever  
a parameter setting is changed. These graphics illustrate the point at which the selected setting falls within the entire  
parameter range, and provide a visual indication of the parameter’s function. As the setting changes, the graphic also  
changes to reflect the new setting. Examples are shown below and on the following page. To view other parameter  
graphics, change the setting of the desired parameter.  
When the Decay parameter setting is changed, the graphics pictured below appear.  
When the HF Rlloff parameter setting is changed, the graphics pictured below appear.  
5-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
MPX 550  
When the Mix parameter setting is changed, the graphics pictured below appear.  
When a delay parameter setting is changed, the graphics pictured below appear.  
When the Level parameter setting is changed, the graphics pictured below appear.  
When the Width parameter setting is changed, the graphics pictured below appear.  
5-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
Lexicon  
Balance  
(-100 to +100%)  
PARAMETER GLOSSARY  
In Rotary programs, determines the volume balance  
between the horn and drum.  
Note:  
System Mode parameters are described in Section 3.  
Dynamics parameters are described on pages 4-32  
to 4-35. These parameters are not included in this  
glossary.  
BassMult  
(0.2 to 4.0x)  
Controls the reverb time for low-frequency signals.  
BassMult works as a multiplier of the Decay and MidRT  
parameters. For example, if BassMult is set to 2.0x, and  
Decay is set to 2 seconds, the low-frequency reverb time  
will be 4 seconds. For a natural-sounding hall ambience,  
BassMult should be set between 1.0x and 2.0x.  
"Adjust"  
(0 to 127)  
Functions differently from preset to preset. "Adjust" is a  
"magic" control that can manipulate several parameters  
at once or provide a set of special values for a single  
control. For example, it may be called (Fast) or (Slow) for  
a parameter that is also settable to any value via another  
control. "Adjust" has a range of 0 to 127 to provide a  
convenient attachment point for a MIDI controller.  
BassXvr  
Sets the frequency below which BassMult applies.  
(28Hz to 19.4kHz, off)  
CmpAttk  
(4 to 125msec)  
Controls the speed at which the compressor responds  
when input signals increase above threshold.  
Attack  
(0 to 100 or 0 to 255)  
Controls the sharpness of the initial response to an input  
signal. High settings cause explosive sounds, while low  
settings cause sounds to build up more slowly with time.  
Attack only affects the level of sound within the first  
50ms or so.  
CmpRatio  
(1:1 (off) to 10:1)  
Sets the ratio of gain reduction for input signals above  
threshold.  
5-4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
MPX 550  
CmpRels  
(4 to 250msec)  
Dly HiCut  
(28Hz to 19.4kHz, off)  
Controls the rate at which the compressor relaxes when  
compressed input signal levels fall.  
Appears in Dual programs where one effect is Dly/Eko,  
providing independent control over the Dly/Eko  
high-frequency output. Dly HiCut applies a high-cut  
filter similar to HF Rlloff to the Delay/Echo effect.  
Decay  
(73ms to 19.61sec or 24ms to 6.53sec)  
Controls reverb time for mid frequency signals. In  
Ambience programs, Decay controls the length of the  
ambience "tail".  
Dly Lvl  
(off, -24dB to 0dB)  
Controls the overall level of the signal fed into the Delay,  
Echo effect.  
Depth  
(0 to 100%)  
Dly Lvl 1, 2, 3  
(off, -48dB to 0dB)  
Controls the level of volume modulation.  
Controls the levels of voice set 1, 2, or 3 for both the left  
and right channels.  
Diffusion  
(0 to 100%)  
Controls the degree to which initial echo density  
increases over time. High settings result in a high initial  
buildup of echo density. (Echo density is also affected by  
Size, with smaller spaces sounding denser.)  
Dly XFbk  
(0 to 100%)  
Determines the feedback of left into right and right into  
left.  
Dly Fbk  
(0 to 100%)  
Serves as a master control determining the feedback of  
left into left and right into right.  
5-5  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
Lexicon  
DlyTapLvl  
(off, -48 to 0dB)  
Efx Bal  
(100:0% to 0:100%)  
Appears in dual programs where one effect is Delay/Echo  
and one or more delay voice is controlled by Tap.  
DlyTapLvl controls the level of the Tap-controlled voice  
that is mixed into the Delay/Echo effect.  
Controls the relative amounts of the two effects in Dual  
programs. In a Dual Stereo (Parallel), Mono Split, or Dual  
Mono configuration, this splits the signal to be fed into  
the two effects. In a Cascade configuration, it also allows  
some of the signal to bypass either of the two effects.  
Drum Dep  
(0 to 100%)  
EkoDly L, R  
(0ms to 1.198sec)  
In Rotary programs, determines the amount of  
modulation produced by the drum.  
Control the timing of single reflections that occur early in  
the decay in the reverb programs. These reflections  
simulate the sound sometimes heard off the back wall of  
a stage or other reflective surface.  
Drum Res  
(-100 to +100%)  
In Rotary programs, determines the amount of  
resonance, i.e. signal, fed back into the effect.  
EkoFbk L, R  
(-100 to 100%)  
Control the amount of repeating echo that simulates a  
flutter echo between parallel walls in the reverb  
programs. The range of these parameters is from -100%  
to 100%, with negative values producing a polarity  
reversal. High settings can cause signal overload.  
Duration  
(140 to 700ms)  
In Gate/Inv programs, determines the length of time that  
passes before the output is cut off.  
HF Rlloff  
(28Hz to 19.4kHz, off)  
Sets the high-frequency cutoff of a low-pass filter.  
5-6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
MPX 550  
HighSlope and LowSlope  
(-16 to +15)  
Intrvl  
(Varies)  
Determine the shape of the reverb envelope for low  
frequencies. HighSlope and LowSlope are found only in  
the Gate/Inv programs. When LowSlope is set to 0, the  
level of low reverb remains unchanged over its duration,  
then cuts off abruptly. Setting LowSlope above 0 causes  
the level of low-frequency reverb to rise smoothly from  
soft to loud until the sound is cut off. The greater the  
slope, the softer the initial reverberation and the more  
pronounced its rise. When set to a negative value, the  
low-frequency reverb drops to a quieter level before  
cutoff. HighSlope is similar to LowSlope, but applies to  
middle and high frequencies.  
Controls the amount of pitch-shift applied. Intrvl values  
are in semi-tones. Pch values are in Cents (1/100th of a  
semi-tone). These values are additive.  
L Dly 1, 2, 3  
(0ms to 5.060sec)  
Sets the delay time of left voice 1, 2, or 3. The Dly/Eko  
effect has three independent voices on each side.  
Level  
(0 to 100%)  
Determines the amount of wet signal present in the  
output. It functions similar to Mix, except it affects the  
wet component only. Level is generally used to balance  
the overall output of two or more programs when Mix is  
set to wet.  
Horn Dep  
(0 to 100%)  
In Rotary programs, determines the amount of  
modulation produced by the horn.  
LowSlope and HighSlope  
(-16 to +15)  
Horn Res  
(-100 to +100%)  
See HighSlope and LowSlope.  
In Rotary programs, determines the amount of  
resonance, i.e. signal fed back into the effect.  
5-7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
Lexicon  
Mix  
(Dry, 1 to 99%, Wet)  
Pitch-shifting requires some time shifting. A true stereo  
(not merely Dual Mono) signal contains components  
that are common to the left and right signals. A proper  
stereo image is maintained only if the phase relationship  
between the left and right signals is maintained. This  
requires that the exact same computation be applied to  
both channels, which is why only one control is provid-  
ed for Pitch presets.  
Mix controls the ratio of unprocessed (Dry) and  
processed (Wet) signal in the output. When the MPX 550  
is patched into a console, this parameter should almost  
always be set to Wet.  
MstrRate  
(0 to 100%)  
In Rotary programs, serves as a master rate control  
affecting both the horn and drum rates.  
PDly (L), (R)  
(0 to 100ms)  
Controls the amount of "look-ahead" required by the  
pitch-shift algorithm. Some amount of pre-delay is  
always in effect, even when this parameter is set to 0.  
Pch Fbk (L), (R)  
(-100% to +100%)  
Controls the amount of feedback through the Pitch pre-  
sets, resulting in repeated echoes with pitch progressing  
up or down.  
Phase  
(0 to 270deg)  
Determines the relative timing between the left and right  
channels.  
Pch (L), (R/S)  
(-2400 to 2600)  
Control the amount of pitch-shift applied to the left and  
right channels. For true stereo programs, the Pch(L)  
parameter is not available and the Pch(R/S) parameter  
means stereo. For mono programs, the Pch(L) and (R/S)  
parameters mean left and right respectively.  
PreDelay  
(0ms to 1.198sec)  
Controls the time delay between the input of signal and  
the onset of reverberation.  
5-8  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
MPX 550  
R Dly 1, 2, 3  
(0ms to 5.060sec)  
RvbLvl  
(off, -48dB to 0dB)  
Sets the delay time of right voice 1, 2, or 3. The Dly/Eko  
effect has three independent voices on each side.  
In Ambience programs, controls the amount of "extra"  
longer-decay reverb added to the effect. In Ambience,  
short-decay early reflections create a real-room sound.  
Rate  
(0 to 50.05Hz)  
Shape  
(0 to 255)  
Controls modulation speeds.  
Controls the buildup of the early reflections that most  
audibly create the sound of a real room. Shape and  
Spread work together; if either is set to 0, the other has  
no effect.  
Res 1, 2  
(-100 to +100%)  
In Chorus programs, control the amount of feedback  
signal.  
Size  
(4.0 to 76.0m)  
Resonanc  
(-100 to +100%)  
Sets the rate of echo density buildup after the initial  
period (which is controlled by Diffusion). It also acts as a  
master control for Decay. Size changes a reverb sound  
from very small to very large. It is recommended to set  
the Size control to the approximate size of the acoustic  
space that is being created before adjusting other  
parameters. The size in meters is roughly equal to the  
longest dimension of the space. (Adjusting the Size  
parameter causes the program to re-load.)  
In Flange programs, controls the amount of feedback.  
Rt HC  
(28Hz to 19.4kHz, off)  
Sets the frequency above which high frequencies are  
rolled off in the reverberated signal, causing reverberated  
signals to grow progressively darker. This results in a  
more natural sound because it simulates the effect of air  
absorption in a real hall. Setting this parameter to a  
low- frequency dampens the audio as it re-circulates, and  
consequently can actually shorten the reverb time.  
5-9  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
Lexicon  
Speed  
(0 to 5000)  
Sweep 1, 2  
(0 to 100ms)  
In Flange programs, controls how rapidly the two  
"flange" voices move.  
In Chorus programs, control the amount of frequency  
variation for two different collections of voices. (The  
Chorus effect simulates six voices with slightly varying  
pitch. Separate controls are available over two sets of  
three voices each.)  
Speed 1, 2  
(0 to 5000)  
In Chorus programs, control the rates at which the  
various voices sweep through frequency.  
Threshld  
(-32 to -0dB)  
Controls the level above which signals are compressed.  
Spread  
(0 to 255)  
Controls the timing between the initial reflections that  
most audibly create the sound of a real room. Shape and  
Spread work together; if either is set to 0, the other has  
no effect.  
Tune 1, 2  
(0 to 100%)  
In Detune programs, determines the amount of  
detuning applied to voices 1 and 2.  
Sweep  
(0 to 100ms)  
In Flange programs, determines the maximum amount  
of time-delay applied to each voice.  
5-10  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Parameter Descriptions  
MPX 550  
Wavform  
(See Below)  
In Tremolo programs, determines volume modulation.  
Settings are defined as follows:  
Setting  
Description  
Sine  
Smooth modulation with polarity reversal.  
Rectified  
Sine  
Smooth modulation with no polarity  
reversal.  
Triangle  
Sawtooth  
Square  
Linear ramp up and down.  
Linear ramp up with sudden reduction.  
Level modulates between maximum  
and minimum.  
Width  
(0 to 100%)  
Determines the effective separation between the left and  
right channels.  
5-11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
6
MIDI Operation  
Learn Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2  
MIDI Channel Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2  
Program Change Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3  
Loading Programs • Activating Bypass or Tap Functions  
Continuous Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4  
MIDI Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6  
MIDI Dumps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6  
Sysex Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7  
MIDI Implementation Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MIDI Operation  
Lexicon  
LEARN MODE  
MIDI CHANNEL ASSIGNMENT  
Learn Mode enables the MPX 550 to "learn" MIDI  
Program Change and Continuous Controller messages.  
To activate and deactivate Learn Mode, press the Store  
and Tap/Cancel buttons simultaneously. The Store and  
Tap/Cancel LEDs will light to indicate that Learn Mode is  
active. The front panel display will then show the current  
patching for EDIT knobs 1 to 4 (Edit Page 1). To access  
knobs 5 to 20, press the Edit Pages to cycle to the desired  
Edit Page.  
A single, selectable MIDI channel is used for all MPX 550  
messages. This channel can be assigned in System Mode  
with the MIDI Channel parameter.  
Note:  
A MIDI channel should be assigned before MIDI  
features are used.  
The unit supports learned patches for Bypass and Tap, as  
well as all available parameters controlled with the front  
panel Edit knobs.  
The parameters controlled with the EDIT  
knobs can be patched to Continuous  
Controller messages.  
Program Change  
messages can be used  
to load programs.  
Press the Store and Tap/Cancel  
buttons simultaneously to activate  
and deactivate Learn Mode.  
Bypass and Tap/Cancel can be  
patched to Program Change and  
Continuous Controller messages.  
6-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MIDI Operation  
MPX 550  
PROGRAM CHANGE MESSAGES  
MIDI Program Banks  
0
1
2
3
4
5
6
7
8
9
Plate  
Gate/Inv  
Hall  
Chamber  
Ambience  
Room  
Tremolo  
Rotary  
10 Detune  
11 Pitch  
19 Pch-Rvb  
20 Chor-Rvb  
21 MSplit Dly  
22 MSplit Rvb  
23 Dual Mono  
24 Cmprssr  
25 Dynamics  
26 Live-FOH  
27 User  
LOADING PROGRAMS  
12 Dly/Eko  
13 Special FX  
14 Flng-Dly  
15 Pch-Dly  
16 Chor-Dly  
17 Dly-Rvb  
18 Flng-Rvb  
Standard MIDI Program Change messages can be used  
to load all 255 presets and 64 user programs. The unit  
conforms to the use of MIDI Continuous Controller 32 to  
execute Bank Select messages. MPX 550 program banks  
are ordered numerically from 0 to 27, beginning with  
the Plate Bank. (See the table at the right for additional  
bank numbers.)  
Chorus  
Flange  
•
Sending Controller 32 with a value of 1 followed by  
Program Change 2 will load the second program  
(Slope Down) in the Gate/Inv Bank.  
Any program can be loaded by selecting its bank with  
Controller 32, then sending the appropriate Program  
Change message.  
Once a bank is selected, all subsequent Program Change  
messages will select programs within that bank until a  
new value for Controller 32 is received, or until another  
program or bank is selected with the front panel  
PROGRAM knob.  
For example, if the Plate Bank is selected:  
•
Sending Program Change 1 will load the first Plate  
program (Small Plate).  
•
Sending Controller 32 with a value of 27 followed by  
Program Change 1 will load the first program in the  
User Bank.  
MIDI Program Change messages can be disabled in  
System Mode with the MIDI Program Change  
parameter.  
6-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MIDI Operation  
Lexicon  
5. Simultaneously press the Store and Tap buttons to  
deactivate Learn Mode.  
ACTIVATING BYPASS OR TAP FUNCTIONS  
The unit can recognize MIDI Program Change messages  
100 to 127 (101 to 128 on some MIDI devices) for  
activating Bypass or Tap functions.  
Some MIDI controllers do not allow repeated Program  
Change messages to be sent with a single button. To  
assist these controllers, the unit also recognizes the next  
highest Program Change message with each Program  
Change message it learns for Bypass and Tap. For  
instance, if Program Change 20 is learned as the source  
for Bypass, Program Change 21 will also control Bypass  
functions. To avoid conflicting Bypass and Tap  
assignments, leave a space between the assignments of  
these two buttons.  
To assign a Program Change message to the Bypass or  
Tap controls:  
1. Simultaneously press the Store and Tap buttons to  
activate Learn mode.  
2. Press the desired front panel button - Bypass or Tap.  
The front panel display will indicate the current  
patch on the selected control.  
CONTINUOUS CONTROLLERS  
The unit recognizes Pitch Bend, AfterTouch, and MIDI  
Continuous Controllers 1 to 31 and 33 to 119.  
3. Send the MIDI Program Change message to the  
MPX 550. The front panel display will indicate the  
new patch on the control, and "Stored" will appear  
briefly in the message area.  
To learn a Continuous Controller:  
1. Simultaneously press the Store and Tap buttons to  
activate Learn mode.  
4. Press the Store button to commit the assignment.  
6-4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MIDI Operation  
MPX 550  
2. Turn the desired EDIT knob or press the desired  
button on the front panel. The front panel display  
will indicate which control is selected, as well as the  
current controller range.  
6. Simultaneously press the Store and Tap buttons to  
deactivate Learn Mode.  
Note:  
When a MIDI controller is assigned to the Bypass  
control, moving the controller above the mid-point  
of its learned range engages Bypass. Moving the  
controller below the mid-point range disengages  
Bypass. When a MIDI controller has been assigned  
to the Tap control, moving the controller above the  
mid-point of its learned range will "tap" the control  
as if the Tap button had been pressed.  
3. Select the desired controller using one of the  
following methods:  
A. Move the MIDI controller through its full range.  
To use a portion of the controller range, limit this  
movement to the desired range. The message  
area on the front panel display will indicate  
incoming MIDI activity.  
B. Rotate the EDIT knob until the desired Controller  
number is displayed. The full range of the  
Controller (0 to 127) will be assumed. This  
method is not available for Bypass and Tap.  
4. Press the Store button to commit to the assignment.  
The word "Stored" will appear briefly in the message  
area of the front panel display.  
5. To assign another front panel control, repeat steps 2  
to 4.  
6-5  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MIDI Operation  
Lexicon  
MIDI CLOCK  
MIDI DUMPS  
The unit recognizes MIDI Clock messages and applies  
the tempo (40 to 400bpm) to programs that use Tap  
Tempo. Connect a MIDI device that outputs MIDI Clock,  
such as the MPX R1 foot controller or a MIDI sequencer,  
to the MPX 550 MIDI IN connector to have the MPX 550  
automatically recognize and begin to process MIDI Clock  
messages. When the tempo of the connected device  
changes, the unit will automatically adjust its delay times  
and modulation rates to match the new tempo.  
MIDI Dumps can be used to save the user programs, the  
selected program, or the System Mode settings and  
Learned Patch assignments to a storage device (typically  
a MIDI sequencer). MIDI Dumps are performed in  
System Mode (see page 3-8).  
To perform a dump of the user programs, the selected  
program, or the System Mode settings and Learned  
Patches:  
This feature can be disabled with the System Mode  
parameter MIDI Clock In.  
1. Press the front panel System button. The System LED  
will light to indicate that System Mode is active.  
Note:  
2. Use the EDIT knob 1 to select:  
When System Mode is active, the unit will not  
respond to MIDI Clock messages. Once System  
Mode is deactivated, the unit will resume  
responding to MIDI Clock messages.  
•
Dump User Bank  
Executes a dump of user programs. Use Edit  
knob 3 to select the desired range of user  
programs: (1-16), (17-32), (33-48), or (49 to  
64). When a user program dump is returned to  
the unit from a MIDI storage device, the unit  
saves it in the appropriate User Bank locations.  
6-6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MIDI Operation  
MPX 550  
•
•
Dump Current Program  
SYSEX MESSAGES  
Executes a dump of the selected program.  
MIDI Sysex messages can be used to access all algorithm  
parameters. More information about using this advanced  
feature with the MPX 550 and other Lexicon products is  
available at www.lexicon.com. The website offers  
instructions, sample messages, and a complete table of  
parameter Sysex addresses.  
Dump System Data  
Executes a dump of System Mode settings and  
Learned Patch assignments.  
3. Press Store to execute the dump.  
4. Press System to deactivate System Mode.  
Note:  
Note:  
Executing MIDI Sysex messages is a complicated  
process. Please observe the cautionary notes  
included on the website.  
MIDI Dumps will not be executed unless the System  
Mode parameter MIDI Out/Thru is set to Out (see  
page 3-6).  
6-7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MIDI Operation  
Lexicon  
MIDI IMPLEMENTATION CHART  
Function  
Transmitted  
Recognized  
Remarks  
Basic  
Channel  
Default  
Channel  
X
X
1
1-16  
Selected in System Mode  
Mode  
Default  
Mode 2  
Messages  
Altered  
X
X
X
X
Note  
Number  
True Voice  
X
Velocity  
Note ON  
Note OFF  
X
X
X (Off=9n, v=0)  
X
After  
Touch  
Keys  
Channels  
X
X
X
OX  
Used as controller  
Selected in System Mode  
Pitch  
Blender  
X
OX  
Used as controller  
Learned  
Control  
Change  
X
OX  
1 to 119 (0 to 32 used as Bank Select)  
Learned  
6-8  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MIDI Operation  
MPX 550  
Function  
Transmitted  
Recognized  
Remarks  
Program  
Change  
True #  
X
0 to 15 = 1 to 16  
16 to 127 ignored; Program Change  
messages 1 to 15 = Program Change  
messages 1 to 16 for selected  
Bank Select  
X
X
program bank as applicable *  
System  
Exclusive  
Lexicon  
Real Time  
non-Real Time  
O
X
X
O
X
X
Lexicon ID = 6; Product ID = 22  
(decimal); Device ID = MIDI Channel  
0 to15 = 1 to 16  
System  
:Song Pos  
:Song Sel  
:Tune  
X
X
X
X
X
X
Common  
System  
Real Time  
:Clock  
:Commands  
X
X
O
X
Aux  
Messages  
:Local ON/OFF  
:All Notes OFF  
:Active Sense  
:Reset  
X
X
X
X
X
X
Mode 1: OMNI ON, POLY  
Mode 3: OMNI OFF, POLY  
Mode 2: OMNI ON, MONO  
Mode 4: OMNI OFF, MONO  
O:  
X:  
Yes  
No  
OX:  
Selectable  
*
Program Change messages that do not correspond to a valid program in the current bank will be ignored.  
6-9  
Download from Www.Somanuals.com. All Manuals Search And Download.  
A
Appendix  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2  
Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Appendix  
Lexicon  
SPECIFICATIONS  
Audio Inputs  
Digital Audio Inputs and Outputs  
Dimensions (W x H x D)  
Connectors  
Level  
Impedance  
XLR, T/R/S balanced  
+8 to +20dBu full-scale  
50K balanced  
Connectors  
Coaxial RCA  
S/PDIF  
(IEC-958, CP-340)  
Width  
Height  
Depth  
19 inches (483mm)  
1.75 inches (45mm)  
4 inches (102mm)  
25K unbalanced  
System Sample Rates  
44.1kHz, 48kHz (Internal Clock and  
S/PDIF Input)  
A/D  
24-bits  
20Hz to 20kHz 1dB  
105dB, typical  
-96dB@1kHz  
Weight  
3 pounds (1.4kg)  
Dynamic Range  
Crosstalk  
Environment  
Operating  
Temperature  
Front Panel Display  
Analog Audio Outputs  
150x32 LCD, backlit  
32 to 104˚F (0 to 40˚C)  
95% non-condensing  
Connectors  
Level  
XLR, T/R/S balanced  
+26dBu balanced  
Relative  
Humidity  
Footswitch  
+20dBu unbalanced  
<600Ω  
Tip/Ring/Sleeve phone jack for Bypass  
and Tap (optional)  
Impedance  
D/A  
RFI/ESD  
24-bits  
20Hz to 20kHz 1dB  
FCC Class B  
European EMC Directive 89/336/ECC  
MIDI Interface Connectors  
Dynamic Range  
Crosstalk  
101dB, typical  
-96dB@1kHz  
IN, OUT/THRU  
Power Requirements  
90 to 250V, 50 to 60Hz; 12.5W, 3-pin IEC  
connector  
Specifications are subject to change without notice.  
A-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Appendix  
MPX 550  
DECLARATION OF CONFORMITY  
Application of Council Directive(s):  
73/23/EEC, 89/336/EEC, and 93/68/EEC  
Standard(s) to which Conformity is Declared:  
Manufacturer:  
EN 55103-1, EN 55103-2, and EN 60065: 1998  
Lexicon, Inc., 3 Oak Park, Bedford, MA 01730-1441 USA  
The equipment identified here conforms to the Directive(s) and  
Standard(s) specified above.  
Type of Equipment:  
Model:  
Dual Channel Processor  
Lexicon MPX 550  
February 2002  
Date:  
Lexicon, Inc.  
Vice President of Engineering  
3 Oak Park  
Bedford, MA 01730-1441 USA  
Tel: 781-280-0300  
Fax: 781-280-0490  
A-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
I
Index  
“Adjust” Parameter . . . . . . . . . . . . .2-3, 5-4  
AC Input Connector . . . . . . . . . . . . . . . .1-8  
Ambience Programs . . . . . . . . . . . . . . . .4-6  
ANALOG INPUTs . . . . . . . . . . . . . . . . . .1-9  
ANALOG OUTPUTs . . . . . . . . . . . . . . . .1-9  
Attack Parameter . . . . .4-33 (Dynamics), 5-4  
Audio Levels, Setting . . . . . . . . . . . . . .1-12  
Audio Tap . . . . . . . . . . . . . . . . . .2-6 to 2-7  
Auto Load Parameter* . . . . . . . . . . . . . .3-7  
Balance Parameter . . . . . . . . . . . . . . . . .5-4  
Bank Name Indicator . . . . . . . . . . . . . . .1-7  
BassMult Parameter . . . . . . . . . . . . . . . .5-4  
BassXvr Parameter . . . . . . . . . . . . . . . . .5-4  
Bypass Button . . . . . . . . . .1-5, 2-7, 6-4, 6-5  
Bypass Mode Parameter* . . . . . . . . .2-7, 3-5  
Cascade Configuration . . . . . . . .4-18, 4-19  
CD-ROM, About the . . . . . . . . . . . .ix to xiv  
Chamber Programs . . . . . . . . . . . . . . . .4-5  
Chor-Dly Programs . . . . . . . . . . .4-18, 4-22  
Chor-Rvb Programs . . . . . . . . . . .4-18, 4-26  
Chorus Programs . . . . . . . . . . . . . . . . .4-10  
Clear User Bank . . . . . . . . . . . . . . . . . . .3-9  
Clock Source Parameter* . . . . . . . . . . . .3-4  
CmpAttk Parameter . . . . . . . . . . . . .2-5, 5-4  
CmpRatio Parameter . . . . . . . . . . . .2-5, 5-4  
CmpRels Parameter . . . . . . . . . . . . .2-5, 5-5  
Cmprssr Programs . . . . . . . . . . . . . . . .4-31  
Compression (Dynamics) . . . . . . . . . . .4-33  
Compressor . . . . . . . . . . . . . . . . . . . . . .2-5  
Compressor Mode Parameter* . . . . . . . .3-5  
Configuration, Routing . . . . . . . . .1-7, 4-18  
Connecting the Unit . . . . . . . .1-10 to 1-11  
Connectors, Rear Panel . . . . . . .1-8 to 1-11  
Continuous Controllers . . . . .6-2, 6-4 to 6-5  
Decay Parameter . . . . . . . . . . . . . . .5-2, 5-5  
Declaration of Conformity . . . . . . . . . . .A-3  
Delay Parameters . . . . . . . . . . . . . . . . . .5-3  
Depth Parameter . . . . . . . . . . . . . . . . . .5-5  
Detune Programs . . . . . . . . . . . . . . . . .4-12  
Diffusion Parameter . . . . . . . . . . . . . . . .5-5  
Digital Output Parameter* . . . . . . . . . . .3-5  
Display Brightness Parameter* . . . . . . . .3-7  
Dly Fbk Parmameter . . . . . . . . . . . . . . . .5-5  
Dly HiCut Parameter . . . . . . . . . . . . . . .5-5  
Dly Lvl 1, 2, 3 Parameters . . . . . . . . . . . .5-5  
Dly Lvl Parameter . . . . . . . . . . . . . . . . . .5-5  
Dly XFbk Parameter . . . . . . . . . . . . . . . .5-5  
Dly/Eko Programs . . . . . . . . . .4-14 to 4-15  
Dly-Rvb Programs . . . . . . . . . . . .4-18, 4-23  
DlyTapLvl Parameter . . . . . . . . . . . . . . .5-6  
Drum Dep Parameter . . . . . . . . . . . . . . .5-6  
Drum Res Parameter . . . . . . . . . . . . . . .5-6  
Dual Function Footswitch . . . . . . . . . . .1-10  
Dual Mono Configuration . . . . . . . . . . .4-18  
*
System Mode Parameters  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Index  
Lexicon  
Dual Mono Programs . . . . . . . . .4-18, 4-30  
Dual Programs . . . . . . . . . . . . .4-18 to 4-30  
Dual Stereo (Parallel) Configuration . . . .4-18  
Dump Current Program . . . . . . . . .3-8, 6-7  
Dump System Data . . . . . . . . . . . . .3-8. 6-7  
Dump User Bank . . . . . . . . . . . . . . .3-8, 6-6  
Duration Parameter . . . . . . . . . . . . . . . .5-6  
Dynamics . . . . . . . . . . . . . . . .4-32 to 4-36  
EDIT Knobs . . . . . . . . . . . . . . .1-5, 1-7, 2-3  
Edit Pages Button . . . . . . . . . . . . . .1-4, 2-3  
Editing Programs . . . . . . . . . . . . . . . . . .2-3  
Efx Bal Parameter . . . . . . . . . . . . .4-19, 5-6  
EkoDly L, R Parameters . . . . . . . . . . . . .5-6  
EkoFbk L, R Parameters . . . . . . . . . . . . . .5-6  
ExpLvl Parameter (Dynamics) . . . . . . . .4-32  
ExpThrsh Parameter (Dynamics) . . . . . .4-32  
Factory Init . . . . . . . . . . . . . . . . . . . . . .3-9  
Flange Programs . . . . . . . . . . . . . . . . .4-11  
Flng-Dly Programs . . . . . . . . . . . .4-18, 4-20  
Flng-Rvb Programs . . . . . . . . . . .4-18, 4-24  
Footswitch Connector . . . . . . . . . .1-8, 1-10  
Front Panel . . . . . . . . . . . . . . . . .1-4 to 1-7  
Front Panel Display . . . . . . . .1-5, 1-6 to 1-7  
Gain Parameter (Dynamics) . . . . . . . . .4-34  
Gain Reduction Meter (Dynamics) . . . . .4-35  
Gate/Inv Programs . . . . . . . . . . . . . . . . .4-3  
Global Tempo . . . . . . . . . . . . . . . . . . . .2-7  
Hall Programs . . . . . . . . . . . . . . . . . . . .4-4  
HF Rlloff Parameter . . . . . . . . . . . . .5-2, 5-6  
HighSlope Parameter . . . . . . . . . . . . . . .5-7  
Horn Dep Parameter . . . . . . . . . . . . . . .5-7  
Horn Res Parameter . . . . . . . . . . . . . . . .5-7  
Input Level Meters . . . . . . . . . . . . . . . . .1-6  
Input Levels, Setting . . . . . . . . . . . . . . .1-12  
Input Meter (Dynamics) . . . . . . . . . . . .4-35  
Input Source Parameter* . . . . . . . . . . . .3-4  
Input Trim Knob . . . . . . . . . . . . . . . . . .1-4  
Input/OVL Indicator . . . . . . . . . . .1-6 to 1-7  
Inputs, Rear Panel . . . . . . . . . . .1-8 to 1-11  
Inspection Instructions . . . . . . . . . .ix to xiv  
Intrvl Parameter . . . . . . . . . . . . . . . . . . .5-7  
L Dly 1, 2, 3 Parameters . . . . . . . . . . . . .5-7  
Learn Mode . . . . . . . . . . . . . . . . . . . . . .6-2  
Level Meters (Dynamics) . . . . .4-34 to 4-35  
Level Parameter . . . . . . . . . . . . . . .5-3, 5-7  
Limited Warranty . . . . . . .Inside Back Cover  
Live-FOH Programs . . . . . . . . .4-36 to 4-37  
Load Button . . . . . . . . . . . . . . .1-5, 2-2, 2-3  
Loading Programs . . . . . . . . . . . . . .2-2, 6-3  
LowSlope Parameter . . . . . . . . . . . . . . .5-7  
Mastering Dynamics . . . . . . . . .4-32 to 4-36  
Matching Rhythm . . . . . . . . . . . . . . . . .2-6  
Memory Protect Parameter* . . . . . . . . . .3-7  
Messages, Front Panel Display . . . . . . . .1-7  
Meters Parameter (Dynamics) . . . . . . . .4-33  
MIDI Channel Assignment . . . . . . . . . . .6-2  
MIDI Channel Parameter* . . . . . . . .3-6, 6-2  
MIDI Clock . . . . . . . . . . . . . . . . . . . . . .6-6  
MIDI Clock Parameter* . . . . . . . . . .3-6, 6-6  
MIDI Dumps . . . . . . . . .3-3, 3-8, 6-6 to 6-7  
MIDI Implementation Chart . . . . .6-8 to 6-9  
MIDI IN Connector . . . . . . . . . . . . . . . .1-8  
MIDI Learn Mode . . . . . . . . . . . . . . . . .6-2  
MIDI OUT/THRU Connector . . . . . . . . . .1-8  
MIDI Out/Thru Parameter* . . . . . . .3-6, 6-7  
MIDI Patches Parameter* . . . . . . . . . . . .3-6  
MIDI Program Banks . . . . . . . . . . . . . . .6-3  
MIDI Program Change Parameter* . . . . .3-6  
Mix Mode Parameter* . . . . . . . . . . . . . .3-5  
Mix Parameter . . . . . . . . . . . . . . . .5-3, 5-8  
Mono Split Configuration . . . . . . . . . . .4-18  
MPX 550, About the . . . . . . . . . .1-2 to 1-3  
MSplit Dly Programs . . . . . . . . . .4-18, 4-27  
MSplit Rvb Programs . . . .4-18, 4-28 to 4-29  
MstrRate Parameter . . . . . . . . . . . . . . . .5-8  
Operating Mode Parameter* . . . .3-6 to 3-7  
Output Level Meter (Dynamics) . . . . . .4-34  
Output Level Parameter* . . . . . . . . . . . .3-4  
*
System Mode Parameters  
I-2  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Index  
MPX 550  
Output Levels, Setting . . . . . . . . . . . . .1-12  
Outputs, Rear Panel . . . . . . . . . .1-8 to 1-11  
OVL Indicator . . . . . . . . . . . . . . .1-6 to 1-7  
Parallel (Dual Stereo) Configuration . . .4-18  
Parameter Glossary . . . . . . . . . .5-4 to 5-11  
Parameter Graphics . . . . . . . . . . .5-2 to 5-3  
Parameters, Dynamics . . . . . . .4-32 to 4-34  
Parameters, System Mode . . . . . .3-2 to 3-7  
Pch (R), (L/S) Parameter . . . . . . . . . . . . .5-8  
Pch Fbk (L), (R) Parameters . . . . . . . . . . .5-8  
Pch-Dly Programs . . . . . . . .4-18, 4-19, 4-21  
Pch-Rvb Programs . . . . . . . . . . . .4-18, 4-25  
PDly (L), (R) Parameters . . . . . . . . . . . . .5-8  
Peak Expansion (Dynamics) . . .4-32 to 4-33  
Peak Expansion Meter (Dynamics) . . . .4-35  
Phase Parameter . . . . . . . . . . . . . . . . . .5-8  
Pitch Programs . . . . . . . . . . . . . . . . . .4-13  
Pitch Shift . . . . . . . . . . . . . . . . . . . . . .4-19  
Plate Programs . . . . . . . . . . . . . . . . . . . .4-2  
Power Switch . . . . . . . . . . . . . . . . . . . . .1-5  
PreDelay Parameter . . . . . . . . . . . . . . . .5-8  
Program Banks, MIDI . . . . . . . . . . . . . . .6-3  
Program Change Messages . .6-2, 6-3 to 6-4  
Program Descriptions . . . . . . . . .4-1 to 4-37  
PROGRAM Knob . . . . . . . . . . .1-5, 2-2, 2-4  
Program Load Mode Parameter* . . . . . . .3-5  
Program Name . . . . . . . . . . . . . . . . . . .1-7  
Program Number . . . . . . . . . . . . . . . . . .1-7  
R Dly 1, 2, 3 Parameters . . . . . . . . . . . . .5-9  
Rate Parameter . . . . . . . . . . . . . . . . . . .5-9  
Ratio Parameter (Dynamics) . . . . . . . . .4-33  
Rear Panel . . . . . . . . . . . . . . . . . .1-8 to 1-9  
Release Parameter (Dynamics) . . . . . . .4-33  
Res 1, 2 Parameters . . . . . . . . . . . . . . . .5-9  
Resonanc Parameter . . . . . . . . . . . . . . . .5-9  
Restore Default Commands . . . . . . .3-3, 3-9  
Room Programs . . . . . . . . . . . . . . . . . . .4-7  
Rotary Programs . . . . . . . . . . . . . . . . . .4-9  
Routing Configuration . . . . . . . . . .1-7, 4-18  
Rt HC Parameter . . . . . . . . . . . . . . . . . .5-9  
RvbLvl Parameter . . . . . . . . . . . . . . . . . .5-9  
S/PDIF Connectors . . . . . . . . . . . . . . . . .1-9  
Speed Parameter . . . . . . . . . . . . . . . . .5-10  
Speed 1, 2 Parameters . . . . . . . . . . . . .5-10  
Spread Parameter . . . . . . . . . . . . . . . . .5-10  
Stereo Stage Program . . . . . . . . . . . . .4-17  
Store Button . . . . . . . . . . . . . .1-5, 2-4, 6-2  
Storing Programs . . . . . . . . . . . . . . . . . .2-4  
Sweep Parameter . . . . . . . . . . . . . . . . .5-10  
Sweep 1, 2 Parameters . . . . . . . . . . . . .5-10  
Sysex Messages . . . . . . . . . . . . . . . . . . .6-7  
System Button . . . . . . . . . . . . . . . .1-4, 3-2  
System Mode . . . . . . . . . . . . . . .3-2 to 3-9  
System Mode Parameters . . . . . . .3-2 to 3-7  
Table of Contents . . . . . . . . . . . . . . . .ii to iii  
Tap/Cancel Button . . . . .1-5, 2-4, 2-6 to 2-7,  
6-2, 6-4, 6-5  
Tap Tempo . . . . . . . . . . . . . .1-7, 2-6 to 2-7  
Tape Saturation (Dynamics) . . . . . . . . .4-34  
Tempo Mode Parameter* . . . . . . . .2-7, 3-5  
Thresh Parameter (Dynamics) . . . . . . . .4-33  
Threshld Parameter . . . . . . . . . . . .2-5, 5-10  
Tremolo Programs . . . . . . . . . . . . . . . . .4-8  
Tune 1, 2 Parameters . . . . . . . . . . . . . .5-10  
Unpacking Instructions . . . . . . . . . .ix to xiv  
Warranty . . . . . . . . . . . . .Inside Back Cover  
Wavform Parameter . . . . . . . . . . . . . . .5-11  
Width Parameter . . . . . . . . . . . . . .5-3, 5-11  
Safety Instructions . . . . . .Inside Front Cover,  
iv to viii, ix to xiv  
Saturation Parameter (Dynamics) . . . . .4-34  
Selecting Programs . . . . . . . . . . . . . . . .2-2  
Setting Audio Levels . . . . . . . . . . . . . . .1-12  
Shape Parameter . . . . . . . . . . . . . . . . . .5-9  
Single Programs . . . . . . . . . . . . .4-2 to 4-15  
Size Parameter . . . . . . . . . . . . . . . . . . . .5-9  
Special FX Programs . . . . . . . . .4-16 to 4-17  
Specifications . . . . . . . . . . . . . . . . . . . . .A-2  
*
System Mode Parameters  
I-3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
daytime telephone number; the product model and serial numbers; and a  
description of the problem. Do not return the unit to Lexicon, Inc. without  
prior authorization.  
LIMITED WARRANTY  
Lexicon, Inc. offers the following warranty on this product:  
When Shipping a Product for Service . . .  
What is the Duration of this Warranty?  
This warranty will remain in effect for one (1) year from the original date of  
purchase.  
1. Pay any initial shipping charges, which are the responsibility of the  
owner. If necessary repairs are covered by this warranty, Lexicon, Inc. will  
pay return shipping charges to any destination in the United States using  
the carrier of our choice.  
2. Pack the unit securely. Package insurance is strongly recommended.  
3. Include a copy of the original dated sales receipt. (A copy of the original  
dated sales receipt must be presented when warranty service is required.)  
4. Do not include accessories such as power cords or user guides unless  
instructed to do so.  
Who is Covered?  
This warranty may be enforced by the original purchaser and subsequent  
owners during the warranty period, provided the original dated sales receipt  
or other proof of warranty coverage is presented at time of service.  
What is Covered?  
This warranty covers all defects in material and workmanship on this product,  
except as specified below. The following are not covered:  
1. Damage resulting from  
What are the Limitations of Implied Warranties?  
Any implied warranties, including warranties of merchantability and fitness for  
a particular purpose, are limited in duration to the length of this warranty.  
A. Accident, misuse, abuse, or neglect.  
B. Failure to follow instructions contained in the User Guide.  
C. Repair or attempted repair unauthorized by Lexicon, Inc.  
D. Failure to perform recommended periodic maintenance.  
E. Causes other than product defects, including lack of skill,  
competence, or experience on the part of the owner.  
2. Damage occurring during any shipment of this product. Claims for  
shipping damages must be made with the carrier.  
What Certain Damages are Excluded?  
Lexicon’s liability for a defective product is limited to repair or replacement of  
that product, at our option. Lexicon, Inc. shall not be liable for damages  
based on inconvenience; loss of use of the product; loss of time; interrupted  
operation; commercial loss; or any other damages, whether incidental,  
consequential, or otherwise.  
3. Damage to a unit that has been altered, or on which the serial number  
has been defaced, modified, or removed.  
How do State Laws Relate to this Warranty?  
Some states do not allow limitations on the duration of implied warranties  
and/or the exclusion or limitation of incidental or consequential damages. As  
such, the above limitations may not apply. This warranty is not enforceable  
outside of North America. This warranty provides specific legal rights.  
Additional rights may be provided by some states.  
What Expenses will Lexicon, Inc. Assume?  
Lexicon, Inc. will pay all labor and material expenses for covered items.  
Payment of shipping charges is discussed in the next section of the warranty.  
How is Service Obtained?  
Lexicon, Inc  
3 Oak Park  
Bedford, MA 01730-1441  
USA  
Tel 781-280-0300  
Fax..781-280-0490  
Customer Support  
Tel 781-280-0300  
Fax..781-280-0495 (Sales)  
Fax..781-280-0499 (Service)  
When this product needs service, write, telephone, or fax Lexicon, Inc. to  
request information about where the unit should be taken or sent. When  
making a written request, please include your name, complete address, and  
A Harman International Company  
www.lexicon.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  
A Harman International Company  
Lexicon, Inc  
3 Oak Park  
Bedford, MA 01730-1441 USA  
Tel 781-280-0300  
Fax 781-280-0490  
www.lexicon.com  
Customer Support  
Tel 781-280-0300  
Fax 781-280-0495 (Sales)  
Fax 781-280-0499 (Service)  
Lexicon Part No. 070-14912 | Rev 1 | 02/02  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Dry Tracks  
This card lists the dry tracks included on the CD-ROM enclosed with this user guide.  
A Harman International Company  
Percussion  
Guitar  
2
Bass Drum . . . . . . . . . . . . . . . . . . . . . .(0:30)  
Snare Drum 1 . . . . . . . . . . . . . . . . . . .(0:46)  
19 Acoustic Chords 1 . . . . . . . . . . . . . . . .(0:59)  
20 Acoustic Chords 2 . . . . . . . . . . . . . . . .(2:13)  
21 Acoustic Chords 3 . . . . . . . . . . . . . . . .(1:12)  
22 Acoustic Leads . . . . . . . . . . . . . . . . . . .(0:41)  
23 Acoustic Stops . . . . . . . . . . . . . . . . . . .(0:36)  
24 Electric Solo . . . . . . . . . . . . . . . . . . . .(0:44)  
25 Electric Clean & Fast . . . . . . . . . . . . . .(0:32)  
26 Electric Dirty . . . . . . . . . . . . . . . . . . . .(1:24)  
27 Electric Crunch . . . . . . . . . . . . . . . . . .(0:38)  
3
4
5
6
7
8
9
Snare Drum 2 . . . . . . . . . . . . . . . . . . .(0:38)  
Stick . . . . . . . . . . . . . . . . . . . . . . . . . .(0:38)  
Shaker . . . . . . . . . . . . . . . . . . . . . . . .(0:39)  
Claps . . . . . . . . . . . . . . . . . . . . . . . . .(0:41)  
Conga . . . . . . . . . . . . . . . . . . . . . . . .(0:48)  
Table & Udo . . . . . . . . . . . . . . . . . . . .(0:54)  
10 Percussion 1 . . . . . . . . . . . . . . . . . . . .(1:00)  
11 Percussion 2 . . . . . . . . . . . . . . . . . . . .(1:23)  
12 Open Drum Kit . . . . . . . . . . . . . . . . . .(1:16)  
13 Funk Drum Kit . . . . . . . . . . . . . . . . . . .(1:08)  
14 Fusion Drums & Bass . . . . . . . . . . . . . .(0:33)  
15 Funk Drums & Bass . . . . . . . . . . . . . . .(0:33)  
16 Fusion Drums & Bass . . . . . . . . . . . . . .(1:18)  
17 Broadband Click . . . . . . . . . . . . . . . . .(0:38)  
18 Narrowband Click . . . . . . . . . . . . . . . .(0:38)  
Bass  
28 Slap (120 bpm) . . . . . . . . . . . . . . . . . .(1:29)  
29 Fingered (120 bpm) . . . . . . . . . . . . . .(0:49)  
Do not play Track 1 on an audio  
WARNING  
CD player. It contains the computer  
portion of the disc and will emit full-  
scale digital noise.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Voice  
Dual Mono (Left/Right)  
30 Female Vocal 1 . . . . . . . . . . . . . . . . . .(0:43)  
31 Female Vocal 2 . . . . . . . . . . . . . . . . . .(0:56)  
32 Female Vocal 3 . . . . . . . . . . . . . . . . . .(0:20)  
33 Male Vocal 1 . . . . . . . . . . . . . . . . . . . .(1:20)  
34 Male Vocal 2 . . . . . . . . . . . . . . . . . . . .(0:21)  
35 Vocal Group 1 . . . . . . . . . . . . . . . . . . .(0:26)  
36 Vocal Group 2 . . . . . . . . . . . . . . . . . . .(0:28)  
46 Kick/Snare . . . . . . . . . . . . . . . . . . . . . .(0:30)  
47 Kick/Bass . . . . . . . . . . . . . . . . . . . . . . .(0:37)  
48 African Bell/Slit Drum . . . . . . . . . . . . . .(0:43)  
49 Acoustic Guitar/Vocal . . . . . . . . . . . . . .(0:23)  
50 Electric Guitar/Vocal . . . . . . . . . . . . . . .(1:31)  
51 Church Guitars . . . . . . . . . . . . . . . . . .(0:36)  
52 Ms. Pride/Xavier . . . . . . . . . . . . . . . . .(1:04)  
Keyboard  
Post  
37 Hammond 1 . . . . . . . . . . . . . . . . . . . .(0:12)  
38 Hammond 2 . . . . . . . . . . . . . . . . . . . .(0:07)  
39 Rhodes . . . . . . . . . . . . . . . . . . . . . . . .(0:59)  
53 Ambulance . . . . . . . . . . . . . . . . . . . . .(0:19)  
54 Motorcycle . . . . . . . . . . . . . . . . . . . . .(1:08)  
55 Street Noise . . . . . . . . . . . . . . . . . . . . .(1:00)  
56 Propeller Place . . . . . . . . . . . . . . . . . . .(0:58)  
57 Jet Airplane . . . . . . . . . . . . . . . . . . . . .(1:02)  
58 Pipe Band . . . . . . . . . . . . . . . . . . . . . .(1:20)  
59 TV Music . . . . . . . . . . . . . . . . . . . . . . .(0:18)  
60 Monologue . . . . . . . . . . . . . . . . . . . . .(1:06)  
Horns  
40 Horn Section 1 . . . . . . . . . . . . . . . . . .(1:23)  
41 Horn Section 2 . . . . . . . . . . . . . . . . . .(1:36)  
42 Sax Solo . . . . . . . . . . . . . . . . . . . . . . .(0:30)  
43 Tenor Sax Solo . . . . . . . . . . . . . . . . . . .(2:21)  
TOTAL TIME . . . . . . . . . . . . . . . . . . . . . .(54:31)  
Miscellaneous  
44 Flute Solo . . . . . . . . . . . . . . . . . . . . . .(0:24)  
45 Accordian Solo . . . . . . . . . . . . . . . . . .(0:35)  
Download from Www.Somanuals.com. All Manuals Search And Download.  

LA Audio Electronic Microphone MS424 User Manual
Lathem Clock ATX6 User Manual
Lenovo Network Hardware 70BG9000NA User Manual
Liebert Power Supply UPS System User Manual
Lightolier Indoor Furnishings 1055LV User Manual
Lucas Industries Router LPT PR0312 User Manual
MacroSystem Digital Video Camcorder SMART EDIT 5 User Manual
Maxtor Computer Drive VL20 User Manual
Mazda Model Vehicle Mazda2_8BL3 EA 10E_Edition3 User Manual
Micro Innovations Mouse PD905P User Manual