Lexicon MPX R1 - V2 REV User manual

Version 2
User Guide
MIDI Remote Controller
MPX R1

Lexicon Inc. • 3 Oak Park • Bedford MA 01730-1441 USA • Tel: [phone] • Fax [phone] • www.lexicon.com
Lexicon Part # 070-11803
Copyright 1998 Lexicon Inc., All Rights Reserved.
Notice
This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the
manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the
limitsforaClassBcomputingdeviceinaccordancewiththespecificationsinSubpartJofPart15ofFCCRules,whicharedesignatedtoprovide
reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause interference to radio ortelevision 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.
Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la class
B prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des Communications du Canada.
Unpacking and Inspection
AfterunpackingtheMPXR1,saveallpackingmaterialsincaseyoueverneedtoshiptheunit.Thoroughlyinspect
the unit and packing materials for signs of damage. Report any shipment damage to the carrier at once; report
equipment malfunction to your dealer.

Contents
1 Product Overview
Introduction ......................................................................................... 1-1
The Front Panel .................................................................................. 1-2
The Rear Panel .................................................................................. 1-3
Installation Notes ................................................................................ 1-4
Power Requirements.....................................................................1-4
Connecting the MPX R1 to an MPX 1 or an MPX G2 .................. 1-4
Stand-alone Configuration ............................................................1-4
2 The MPX R1 as a Dedicated MPX G2 Controller
MPX G2 and MPX R1 Connections.................................................... 2-1
Working in Program Mode .................................................................. 2-1
A/B, Tap/Tempo, Bypass, Toe and Pedal.................................... 2-1
Loading Programs........................................................................ 2-1
Direct Access Mode............................................................... 2-2
Tuner ................................................................................................2-2
FX Mode ..............................................................................................2-3
Relay State Programming .................................................................. 2-4
3 The MPX R1 as a Dedicated MPX 1 Controller
MPX 1 Software Requirements ...........................................................3-1
MPX 1 and MPX R1 Connections ...................................................... 3-1
Working in Program Mode .................................................................. 3-1
A/B, Tap/Tempo, Bypass, Toe and Pedal.................................... 3-1
Loading Programs........................................................................ 3-2
Direct Access Mode............................................................... 3-2
FX Mode ..............................................................................................3-3
Relay State Programming .................................................................. 3-3
Changing Programs vs. Bypassing Effects in a Guitar Rig .................3-4
Using the MPX 1 and the MPX R1 in a Guitar Amp Effects Loop .......3-4
Using the MPX 1 and the MPX R1 in a Preamp/Power Amp Rig or
a Dry/Wet (3-way) Rig.................................................................. 3-5
Using a Series Loop ........................................................................... 3-5
Using a Parallel Loop ......................................................................... 3-6
4 Using the MPX R1 with Other MIDI Devices
Connections........................................................................................ 4-1
Working in Program Mode .................................................................. 4-1
A/B, Tap/Tempo, Bypass, and Toe Switch ...................................4-1
Loading Programs........................................................................ 4-1
Direct Access Mode............................................................... 4-2
FX Mode ..............................................................................................4-2
Relay State Programming .................................................................. 4-3

Contents, cont'd. 5 Editing
Edit Mode Program Parameters ......................................................... 5-2
Edit Mode FX Parameters .................................................................. 5-5
The Relays ......................................................................................... 5-6
Latching........................................................................................ 5-6
Momentary, normally open........................................................... 5-6
Momentary, normally closed ........................................................ 5-6
Relay State Programming ............................................................ 5-7
Assigning the Relay with tip and ring ........................................... 5-7
Removing Relay Settings for all programs................................... 5-7
6 Advanced Applications
Transmitting Multiple MIDI Messages on Separate MIDI Channels ... 6-1
Setups .......................................................................................... 6-1
Activating Setups and Direct Device Control......................... 6-1
Creating a Setup.................................................................... 6-1
Setup Parameters.................................................................. 6-2
Clearing a Setup .................................................................... 6-3
Direct Device Control.......................................................................... 6-4
Alternative Connections...................................................................... 6-4
2 MIDI Cables and an MSA Adapter ............................................ 6-4
5-pin Connection (1 Cable for two-way MIDI with power
from an adapter) .................................................................... 6-4
7 Troubleshooting
Low Voltage ........................................................................................ 7-1
Overheating ........................................................................................ 7-1
Common MIDI Problems .................................................................... 7-1
Adjusting Pedal Tension..................................................................... 7-2
Reinitialization .................................................................................... 7-2
Reinitialization of the MPX R1...................................................... 7-2
Reinitialization of the MPX G2 or the MPX 1 and the MPX R1 .... 7-2
8 Specifications
Specifications ..................................................................................... 8-1
MIDI Implementation .......................................................................... 8-2

1-1
Product Overview
1
Product Overview
The MPX R1 MIDI Remote Controller performs as a dedicated MIDI controller
for the Lexicon MPX G2, the MPX 1, or as a stand-alone MIDI control unit. Any
way you use it, you'll appreciate its rugged, road-worthy construction and
straightforward control surface.
The MPX R1 has two basic operating modes: Program Mode and FX Mode.
Program Mode isusedfor sending MIDIProgram Changemessages. FXMode
is used to send other MIDI data such as Controller messages, and for selecting
theunit'sbuilt-in4-staterelay. WhenusedwiththeMPXG2 orMPX1,FXMode
functions like a "virtual pedalboard". Individual effect blocks can be turned on
and off, and three-state LEDs (off, red and green) indicate whether the effect
block is unavailable (not programmed as part of the preset), off or on.The front
panel FX button toggles between Program and FX modes.
In this manual, the available functions for different applications are presented
separately— soyoucaneasilyfindthesectionsyouneedtogetupand running
quickly.
This first section presents general information about the R1 controls, as well as
some basic information on installation, connections and power requirements.
Chapter 2 concentrates solely on using the R1 with the MPX G2, Chapter 3 on
using the R1 with the MPX 1. Chapter 4 discusses the operation of the R1 as
a stand-alone MIDI controller. Editing functions are discussed in Chapter 5,
followed by a section detailing advanced applications.
Introduction

LexiconMPX R1 Version 2 User Guide
1-2
The Front Panel
Display
FS1, FS2 and FS3 LEDs light to indicate state of
external foot switches.
3-Digit Display indicates ID number of currently
loaded program.
Tempo LED flashes in time with current tempo rate
when Tap is active.
A/B LEDs light to indicate A/B function is active.
Bank/Parameter Select
Buttons increment and decrement program banks
or select adjustable parameters for editing. Press-
ingandholdingeitherbuttonactivatesfastscrolling.
Tap
When Tempo LED is flashing, sets tempo.
(Presstwoormoretimesinrhythmtoestablish
tempo rate.)
A/B
Assignable switch, when
used with the MPX 1, acti-
vates a variable glide be-
tween patched parameters.
Programmable Pedal
Operatesasanassignable MIDI
Continuous Controller. Toe
Switch allows patched effects to
be turned on and off.
Bypass
Assignable switch sends
a MIDI Controller value
BYPASS ON=127
BYPASS OFF=0
When held, activates the
MPX G2 Tuner.
FX
Toggles between Program and FX Modes.
LED off indicates Program Mode is active.
LED on indicates FX Mode is active.
Switches (0-9)
PresstocompleteaProgramChangemessagewhich
consists of the current Bank number and the switch
number (0-9). In FX mode, switches can be pro-
grammed to transmit any MIDI Controller, Clock com-
mands, Relay settings or MIDI Program Change.
Switches 0-9 are used for entering Program Change
selections in Direct Access Mode.

1-3
Product Overview
The Rear Panel
MIDI
OUT/REMOTE
5-pin DIN connector for MIDI OUT
or
7-pin DIN connector for MIDI OUT
and bidirectional MIDI remote (for
use with MPX 1 or MPX G2).
IN
5-pin DIN connector receives MIDI
data from other equipment.
THRU
5-pin DIN connector passes any
MIDI data received without change.
Foot Switch
1/4" Tip/Ring/Sleeve phone
jack for as many as three
independent footswitches.
Toe Switch
Assignable switch sends MIDI Con-
troller value ON=127; OFF=0.
Foot Pedal
1/4" Tip/Ring/Sleeve phone jack
provided for foot pedalwith 10kΩ
to 50kΩimpedance.
POWER
UseLexiconMSApoweradapter,or
9 VAC 1 amp equivalent. Jack is
unusedwhenpoweringthe MPXR1
with the 7-pin DIN connector.
For control-voltage input, use a 1/4" stereo plug with Sleeve connected to
ground, Tipconnected tothe controlvoltage, and Ringunconnectedorshorted
to ground..
Relay
1/4" Tip/Ring/Sleeve phone jack
software selectable as a momen-
tary or latching switch.
Edit/Run
Toggle switch for entering Edit mode.
Foot Switch
Foot Pedal
Relay

LexiconMPX R1 Version 2 User Guide
1-4
Installation Notes
Use Lexicon MSA power adapter, or 9 VAC 1 amp equivalent.
Power Requirements
Connect a 7-pin DIN cable between the MPX (1 or G2) and the MPX R1.
Connect the MPX (1 or G2) to the MSA adapter provided with the MPX R1.
Connecting the MPX R1
to an MPX 1 or an
MPX G2
Stand-alone
Configuration
Foot
Switch
Foot Pedal
5-pin DIN Cable
Foot
Switch
Foot Pedal
Relay
(Amp Channel Select)
to AC Power
Source
7-pin DIN
Cable
Relay
(Amp Channel Select)
to Lexicon
MSA Adapter
to Lexicon
MSA Adapter
IN
IN
THRU
5-pin DIN Cable
OUT
MIDI Device 1
MIDI Device 2

2-1
The MPX R1 as a Dedicated MPX G2 Controller
2
The MPX R1 as a
Dedicated MPX G2
Controller
When an MPX R1 is connected to an MPX G2, two-way communication is
accomplished via MIDI System Exclusive messages. This allows immediate
response by both units to actions on either front panel.
Connectthe poweradapter provided withthe MPX R1to theMPX G2REMOTE
POWER input jack and to a wall outlet.
Power up the MPX G2 and connect the 7-pin DIN cable provided with the
MPX R1 between the MPX G2 rear panel IN/REMOTE jack and the MPX R1
MIDI OUT/REMOTE.
The MPX R1 will cycle through a power-up routine, lighting various LEDs, and
then display Con. The MPX G2 will display Remote Connected. These
messages indicate that proper bidirectional control has been established.
When the MPX G2 powers up, it will default to Program Mode. The MPX R1
should also power up in Program Mode. (FX button LED should be off.) In this
mode,theMPX R1sendsMIDIProgramChangeandBankSelectmessagesto
load MPX G2 programs.
These four switches and continuous controller transmit specific MIDI System
Exclusive or Control Change messages regardless of the mode of operation.
Inthis mode, thestate of A/Bandthe TempoLED rate willautomatically update
tothe stateof the currentlyloaded program.For example, ifyou load a program
set to 100 beats per minute (BPM), the MPX R1 will flash at 100 BPM, just as
the MPX G2does. Ifyou then load aprogram set to120 BPM, the Tempo LED
ontheMPXR1willincreasefrom100to120BPMwhenthenewprogramloads.
Pressing and holding the TAP button on the MPX R1 will display the current
tempo in BPM on the R1 display.
MPX G2 and MPX R1
Connections
Working in
Program Mode
A/B Tap/Tempo, Bypass,
Toe and Pedal
Loading Programs
The first two digits on the display indicate the bank number. The third digit
indicates the program number. The BANK buttons select banks, and switches
0-9 select programs within the displayed bank. Programs are loaded whenever
one of the numbered switches is pressed.
To load a new program within the same bank, press any of the numbered
switches (0-9).
To select a program in a different bank, press the BANK buttons to step to the
bank you want, or hold down either button to scroll through the numbers. The
rightmostdigit, which is reserved for program numbers, will turnoff during bank
selection.Onceyouhaveselectedthedesiredbank,pressthenumberedswitch
to load the program number within that bank.

LexiconMPX R1 Version 2 User Guide
2-2
Use the BANK buttons to select a
bank number. The first two digits
onthedisplayshowyourselection
— bank 23 in this example.
Press one of the switches num-
bered0-9toselectaprogramwithin
the selected bank. The third digit
shows our selection — program 5.
Direct Access Mode YoucanalsoenterprogramnumbersdirectlyinDirectAccess Mode.Pressand
hold the FX button until its LED begins blinking. The display will flash d-A to
indicate that Direct Access Mode is active. Now you can select programs by
directlyenteringtheirprogramnumbers.Forexample,toloadMPXG2Program
135, press 1, then 3, then 5on the MPX R1.
Inthismode,theBANKbuttonsincrementanddecrementtheprogramnumbers
in consecutive steps.
Press the FX button once to exit to FX Mode, twice to exit to Program Mode.
Tuner
Notes displayed when the
MPX G2 Tuner is activated. When the MPXG2detects anote which is flat
(A in this example), the lower display seg-
ments will flash and the Flat LED will light.
The display segments will flash faster as
the note approaches the correct pitch.
When the correct pitch is reached, the
center display segments will light
steadily, along with the Tune LED.
The MPX G2 tuner can also be viewed on the MPX R1. When the tuner is
activated,theMPXG2willdisplayalettercorrespondingtotheclosestsemitone
itdetects(includingsharpandflatnotes)andindicatewhetherthenoteissharp,
flat, or in tune. The out-of-tune display segments will flash increasingly faster
as a note reaches the correct pitch. The following example shows the display
progression as a flat A is brought in tune.

2-3
The MPX R1 as a Dedicated MPX G2 Controller
A detected note which is sharp will be displayed in the same manner, with the
upper display segments and the Sharp LED used as indicators.
Whenanoteisdetectedasa completehalf-tonestepupfromanaturalnote,the
LED at the upper right of the displayed letter identifies it as (in this example) an
A#. An A# is displayed as an in-tune note,
with the # indicator lit.
For more information on Tuner functionality, please refer to the MPX G2 User
Guide.
FX Mode
Buttons 1-4 and 6-9 bring MPX G2 effects (Gain, Chorus, Delay, Effect 1,
Reverb, EQ, Insert and Effect 2) in and out of bypass. The LED for each button
indicates the current state of the MPX G2 Effect:
Green = MPX G2 Effect on
Red = MPX G2 Effect bypassed, but available
Off = MPX G2 Effect unavailable
As in Program mode, the R1 will update to match the current MPX G2 A/B,
Tempo and Bypass states of the currently loaded program. If you press any of
thesecontrolsontheMPXG2,orifyouloadanewprogramfromtheMPX1,the
R1 will update accordingly.
FX Mode allows you to turn on and off any of the active effects in the current
program. To access FX Mode, press the MPX R1 FX button. The LED next to
the button will light to indicate you are in FX Mode.
The FX LED is lit when FX Mode
is active.

LexiconMPX R1 Version 2 User Guide
2-4
Relay State
Programming You can also control the MPX R1 4-state relay in FX mode.
A relay is simply an electronic switch that can tell a circuit (typically an amp's
channel-switching scheme, or reverb and tremolo status) what "state" to go to.
Manufacturers use different schemes, or "logic states" to accomplish similar
tasks, and the MPX R1 can be programmed to satisfy these requirements,
allowingyou,for example,to use yourMPX R1 as areplacement foryouramp's
channel-switching footswitch.
Storing a Relay State
Therelaystate canbe storedwitheach MIDIProgram Change message.To do
this,select thedesired MIDIprogram on the MPX R1and pressthe MPXR1 FX
button to enter FX mode
The relay states are assigned to the following buttons as factory defaults.
ON/OFF 1 = Relay state 1
ON/OFF 2 = Relay state 2
Press the button assigned to the desired relay state and hold the button down
for two seconds. The relay state (for example, CH1) will flash once on the MPX
R1 display to indicate that it has been stored with the program.
Clearing a Relay State
Tocleararelaystate,pressandholdanybuttonnotassignedtoarelaychannel.
Hold this button down for two seconds until – – – flashes once on the display to
indicate the relay state for that program has been removed.
Removing Relay Settings for All Programs
To reset all of the relay settings to Not Assigned, go to Edit: Program Mode
(Press and hold the rear panel EDIT/RUN switch until Edt appears on the
display.) Use the BANK/Parameter Select buttons to select the Relay Initialize
parameter (rEi). Press Yes/+ to reset all of the relays. Note that the relays stay
in their last state (based on the last physical button press) until a button is
pressedtoassignadifferentstate.BrieflypressandreleasetherearpanelEDIT/
RUN switch to exit Edit Mode.

3-1
The MPX R1 as a Dedicated MPX 1 Controller
3
The MPX R1 as a
Dedicated MPX 1
Controller
As the MPX R1 panel overlay is designed primarily for use with the MPX G2,
some of the control labels are not relevant to the MPX 1. For the convenience
of MPX 1 users, replacement labels are provided on the adhesive sheet
containingthe MPX R1 QuickReference Chart. Tomodify thepanel overlay for
MPX 1 functions, relabel the GAIN control with the PITCH label, the INSERT
labelwiththeMODlabel,andplacetheblanklabelovertheHOLDFORTUNER
label (above the BYPASS button).
When an MPX R1 is connected to an MPX 1, two-way communication is
accomplished via MIDI System Exclusive messages. This allows immediate
response by both units to actions on either front panel.
Usingthe MPX R1with the MPX 1requires V1.10software tobe installed inthe
MPX1.(ThesoftwareversionisshownontheMPX1displayonpowerup.)Once
this software is installed in your MPX 1, the following simple procedure will get
you up and running quickly. Note that these instructions assume a general
knowledgeofMPX1operation.Ifyouareafirst-timeMPX1user,pleasereview
the MPX 1 User Guide for general instruction.
Connect the power adapter provided with the MPX R1 to the MPX 1 REMOTE
POWER input jack and to a wall outlet.
PoweruptheMPX1andconnectthe7-pinDINcableprovidedwiththeMPXR1
between the MPX 1 rear panel IN/REMOTE jack and the MPX R1 MIDI OUT/
REMOTE.
The MPX R1 will cycle through a power-up routine, lighting various LEDs, and
then display Con. The MPX 1 will display Remote Connected. These mes-
sages indicate that proper bidirectional control has been established.
WhentheMPX1powersup,itwilldefaulttoProgramMode.TheMPXR1should
also power up in Program Mode. (FX button LED should be off.) In this mode,
the MPX R1 sends MIDI Program Change and Bank Select messages to load
MPX 1 programs.
These four switches and continuous controller transmit specific MIDI System
ExclusiveorControlChangemessagesregardlessofthemodeofoperation. In
Program Mode, the state of A/B and the Tempo LED rate will automatically
update to the state of the currently loaded program. For example, if you load a
program set to 100 beats per minute (BPM), the MPX R1 will flash at 100 BPM,
just as the MPX 1 does. If you then load a program set to 120 BPM, the Tempo
LED on the MPX R1 will increase from 100 to 120 BPM when the new program
loads. Pressing and holding the TAP button on the MPX R1 will display the
current tempo in BPM on the R1 display.
MPX1 and MPX R1
Connections
MPX 1 Software
Requirements
Working in
Program Mode
A/B Tap/Tempo, Bypass,
Toe and Pedal

LexiconMPX R1 Version 2 User Guide
3-2
Loading Programs
Use the BANK buttons to select a
bank number. The first two digits
onthedisplayshowyourselection
— bank 23 in this example.
Press one of the switches num-
bered0-9toselectaprogramwithin
the selected bank. The third digit
shows our selection — program 5.
Direct Access Mode YoucanalsoenterprogramnumbersdirectlyinDirectAccess Mode.Pressand
hold the FX button until its LED begins blinking. The display will flash d-A to
indicate that Direct Access Mode is active. Now you can select programs by
directly entering their program numbers. For example, to load MPX 1 Program
135, press 1, then 3, then 5on the MPX R1.
Inthismode,theBANKbuttonsincrementanddecrementtheprogramnumbers
in consecutive steps.
Press the FX button once to exit to FX Mode, twice to exit to Program Mode.
The first two digits on the display indicate the bank number. The third digit
indicates the program number. The BANK buttons select banks, and switches
0-9 select programs within the displayed bank. Programs are loaded whenever
one of the numbered switches is pressed.
To load a new program within the same bank, press any of the numbered
switches (0-9).
To select a program in a different bank, press the BANK buttons to step to the
bank you want, or hold down either button to scroll through the numbers. The
rightmostdigit, which is reserved for program numbers, will turnoff during bank
selection.Onceyouhaveselectedthedesiredbank,pressthenumberedswitch
to load the program number within that bank.

3-3
The MPX R1 as a Dedicated MPX 1 Controller
FX Mode
Buttons 1, 2, 3, 6, 7 and 8 bring MPX 1 effects (Pitch, Chorus, Delay, Reverb,
EQandMod)inandoutofbypass.TheLEDforeachbuttonindicatesthecurrent
state of the MPX 1 Effect:
Green = MPX 1 Effect on
Red = MPX 1 Effect bypassed, but available
Off = MPX 1 Effect unavailable
AsinProgrammode,theR1willupdateto matchthecurrentMPX1A/B,Tempo
and Bypass states of the currently loaded program. If you press any of these
controls on theMPX 1,or if you load a new program fromthe MPX 1, the R1 will
update accordingly.
You can also control the MPX R1 4-state relay in FX mode.
A relay is simply an electronic switch that can tell a circuit (typically an amp's
channel-switching scheme, or reverb and tremolo status) what "state" to go to.
Manufacturers use different schemes, or "logic states" to accomplish similar
tasks, and the MPX R1 can be programmed to satisfy these requirements,
allowingyou,for example,to use yourMPX R1 as areplacement foryouramp's
channel-switching footswitch.
Storing a Relay State
Therelaystate canbe storedwitheach MIDIProgram Change message.To do
this,select thedesired MIDIprogram on the MPX R1and pressthe MPXR1 FX
button to enter FX mode
The relay states are assigned to the following buttons as factory defaults.
EFFECT 1 = Relay state 1
ON/OFF 1 = Relay state 2
EFFECT 2 = Relay state 3
ON/OFF 2 = Relay state 4
FX Mode allows you to turn on and off any of the active effects in the current
program. To access FX Mode, press the MPX R1 FX button. The LED next to
the button will light to indicate you are in FX Mode.
The FX LED is lit when FX Mode
is active.
Relay State Programming

LexiconMPX R1 Version 2 User Guide
3-4
When you load a new program, it takes about 100 milliseconds for the MPX 1
to fade out the old program and then fade in the new program. (That’s about a
16th note at 120 BPM.) For most musical situations that’s plenty of time. For
those situations where you really need to “nail” a sound change, you can be
more precise by using the individual effect bypass buttons (in FX Mode) to
instantly turn individual effects on or off.
For example, at the beginningof a tune, load apreset (using Program or Direct
Access Mode) with the effects you want — say, Chorus, Delay and Reverb.
Then,while you're playing,turnthe desiredeffectson andofffrom FX Mode via
the MPX R1 effect buttons.
First, connect the Effects Loop Send(s) to the MPX 1 Input(s).
If the Effects Loop send has two outputs (L, R):
connect them to the left and right inputs of the MPX 1. On the MPX 1,
press System, select Audio: Input Mode and set it to Stereo.
If the Effects Loop has only one output:
connect it to the left input of the MPX 1. On the MPX 1, press System,
select Audio: Input Mode and set it to Mono(L only).
Connect the MPX 1 Output(s) to the amp's Effects Loop Return(s)
If the Effects Loop has left and right return inputs:
connect them to the left and right outputs of the MPX 1.
If the Effects loop has only a single return input:
connect it to the left output of the MPX 1. (Effects will be richer if both
outputs canbe used,but MPX 1V1.10 presets (100through 159)have
been optimized for use with only one output connected.
Changing Programs
vs. Bypassing Effects
in a Guitar Rig
Using the MPX 1and
the MPX R1 in a Guitar
Amp Effects Loop
Press the button assigned to the desired relay state and hold the button down
for two seconds. The relay state (for example, CH1) will flash once on the MPX
R1 display to indicate that it has been stored with the program.
Clearing a Relay State
Tocleararelaystate,pressandholdanybuttonnotassignedtoarelaychannel.
Hold this button down for two seconds until – – – flashes three times on the
display to indicate the relay state for that program has been removed.
Removing Relay Settings for All Programs
To reset all of the relay settings to Not Assigned, go to Edit: Program Mode
(Press and hold the rear panel EDIT/RUN switch until Edt appears on the
display.) Use the BANK/Parameter Select buttons to select the Relay Initialize
parameter (rEi). Press Yes/+ to reset all of the relays. Note that the relays stay
in their last state (based on the last physical button press) until a button is
pressedtoassignadifferentstate.BrieflypressandreleasetherearpanelEDIT/
RUN switch to exit Edit Mode.

3-5
The MPX R1 as a Dedicated MPX 1 Controller
IfyouareusingtheMPX1betweenaguitarpreampandpoweramp,refertothe
following section on using a series effect loop.
Ifyou are using the MPX 1 ina dry/wet(3-way) rig, refer to the following section
on using a parallel effects loop.
What kind of effects loop do
you have?
In a series effects loop, the entire
preamp signal passes through the
MPX 1. (If you turn down theMPX 1
Output Level control, no sound
comes out of the amplifier.)
In a parallel loop, the preamp signal
is routed directly to the power amp
and the MPX 1 output is mixed with
it. (If you turn down the MPX 1 Out-
put Level control, you still hear the
guitar at normal level.)
Some amps have a mix control for
theloop.Thisissometimesaswitch
labeled “50/50” or“mix,”or amix pot
with a range of0-100%. These con-
trols allow you to use the loop as
either series or parallel. With a
switch, the 50/50, or mix, position
corresponds to parallel, the other
position corresponds to series. In
the case of a mix pot, 100% corre-
sponds to series and all other posi-
tionsareparallel.(Halfwayor50%is
a good starting place.)
Using the MPX 1 and
the MPX R1 in a
Preamp/Power Amp
Rig or a Dry/Wet
(3-Way) Rig
Using a Series Loop
On the MPX 1:
Press System and make the following adjustments.
• Set Pgm Bypass to Bypass.
• Set Audio Bypass Level to –3dB.
(Thesesettingswillensurethataudiowillbesmoothanduninterruptedduring
program changes.)
• Set Bypass Mode to Bypass. (You will hear dry guitar when bypass is on.)
• Set Mix Mode to Program so that each program will load with its own
independent master wet/dry mix value. (The master mix value for each
preset is initially set to work with the MPX 1 in a series effect loop.)
Adjust Mix and Level Values as follows:
• Toadjusttheoverallmixofdryguitartoalleffectsinanyprogram: pressMix,
select Mstr Mix, and change the value to suite your taste.
• To adjust the mix or level or any of the effects in the program: press Mix,
select the Mix or Level parameter for the desired effect block and adjust. If
you want to make the changes permanent, be sure to store your changes
before loading a new program.
Set Input and Output Levels:
Before powering up the guitar amp, make your audio connections, turn the
MPX1Output Level alltheway down, andturnyour guitaramp master volume
all the way down.
Thiscanbealittletricky, sinceyoumustset theMPX 1outputlevel tomatchthe
level of the preamp with nothing connected in the loop. If the levelsare too low,
the amp will not have its usual power and tone. If the levels are too high, you
may overload the power amp – causing unwanted distortion. If your amp has
a loop bypass (like a Mesa/Boogie Mk IV), it’s pretty easy to match the levels.
Ifnot, it willtake alittle more work. The extra effort isworth it— when the levels
are properly matched, your amp’s tone will be unaffected and you will be able
to use phase shifter, tremolo, wah and other “in-line” effects to their fullest
potential.
• Power up the amp.
• Load MPX 1 Preset 100 Guitar Solo.
• Press Bypass.
• Set the preamp controls to the highest gain settings you’ll be using.
• Turn up the MPX 1 Input Level control so that the 0 dB lights occasionally,
then back it off a bit.

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• Bring up the amp master volume to a point corresponding to a reasonable
listening level. (You won’t hear anything yet.)
• Turn the MPX 1 Output Level control a little more than halfway up (at about
1:00 o’clock). You should now hear sound.
• Compare this level with the level when the MPX 1 is disconnected from the
loop.(Thisis the tricky part — ifyour amp hasa loop bypass, just bypass the
loop. If it has a loop mix control, set the control to 0%. If not, you may have
to physically disconnect the MPX 1 from the loop.)
• AdjusttheMPX1Outputlevelcontrolsothattheamp'sloudnessisthesame
as when the MPX 1 is not in the loop.
On the MPX 1:
Press System and make the following adjustments.
• Set Pgm Bypass to Mute.
• Set System Bypass Mode to Input Mute (delay and reverbs will “ring out”
when Bypass is on) or All Mute (effects are muted when Bypass is on).
• Set Mix Mode to Global, press Mix and set Mstr Mix to 100%.
Adjust Mix and Level Values as follows:
• Toadjusttheoverallmixofdryguitartoalleffectsinanyprogram, pressMix,
select Mstr Level, and change the value to suite your taste.
• To adjust the mix or level or any of the effects in the program: press Mix,
select the Mix orLevel parameter for the desired effect block and adjust. (If
you want to make the changes permanent, be sure to store your changes
before loading a new program.)
Set Input and Output Levels:
Before powering up the guitar amp, make your audio connections, turn the
MPX1Output Level alltheway down, andturnyour guitaramp master volume
all the way down.
[This is pretty simple, as you’re just adding the MPX 1 output to your normal
guitar sound.]
• Power up the amp.
• Load MPX Preset 100, Guitar Solo.
• Set the preamp controls to the highest gain settings you’ll be using.
• Turn up the Input Level control so that the 0 dB lights occasionally when
you're playing your loudest, then back it off a bit.
• Bring up the amp master volume to the desired listening level.
• Turn up the MPX 1 Output Level to the desired effects level.
Using a Parallel Loop

4-1
Using the MPX R1 with Other MIDI Devices
4
Using the MPX R1
with Other MIDI
Devices
The MPX R1 is designed with its default status set for MPX G2 operation, but
it can be used as a stand-alone controller for any standard MIDI device. When
used this way, the MPX R1 transmits MIDI Program Change and Control
Change messages, and controls the built-in 4-state relay.
Connecta5-pinDINMIDIcablebetweentheMPXR1rearpanelOUT/REMOTE
jackandMIDIINjackofthedeviceyouwishtocontrol.ConnecttheLexiconMSA
Adapter between the POWER jack on the MPX R1 and a wall outlet.
To control multiple devices, connect MIDI cables between the MIDI IN ports of
each new device and the THRU ports of each preceding device.
WhentheMPX1powersup,itwilldefaulttoProgramMode.TheMPXR1should
also power up in Program Mode. (FX button LED should be off.) In this mode,
the MPX R1 sends MIDI Program Change and Bank Select messages to load
MPX 1 programs.
These four switches transmit information regardless of the mode of operation.
They can be programmed to output any of the sources listed in Edit: FX Mode.
The first two digits on the display indicate the bank number. The third digit
indicates the program number. The BANK buttons select banks, and switches
0-9 select programs within the displayed bank. Programs are loaded whenever
one of the numbered switches is pressed.
To load a new program within the same bank, press any of the numbered
switches (0-9).
To select a program in a different bank, press the BANK buttons to step to the
bank you want, or hold down either button to scroll through the numbers. The
rightmostdigit, which is reserved for program numbers, will turnoff during bank
selection. Once you have selected the bank you want, press the numbered
switch to load the desired program within that bank.
Connections
Working in
Program Mode
Loading Programs
Use the BANK buttons to selecta
bank number. The first two digits
onthedisplayshowyourselection
— bank 23 in this example.
Press one of the buttons numbered
0-9 to select a program within the
selected bank.Thethirddigitshows
our selection — program 5.
A/B, Tap/Tempo, Bypass
and Toe Switch

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4-2
Direct Access Mode YoucanalsoenterprogramnumbersdirectlyinDirectAccessMode.Pressand
hold the FX button until its LED begins blinking. The display will flash d-A to
indicate that Direct Access Mode is active. Now you can select programs by
directly entering their program numbers. For example, to load MPX 1 Program
135, press 1, then 3, then 5on the R1.
Inthismode,theBANKbuttonsincrementanddecrementtheprogramnumbers
in consecutive steps.
Press the FX button once to exit to FX Mode, twice to exit to Program Mode.
FX Mode FX Mode allows you to use the MPX R1 buttons numbered 0-9 as MIDI
Controllers. To access FX Mode, press the MPX R1 FX button. The LED next
to the button will light to indicate you are in FX Mode.
The FX LEDis lit when FX mode
is active.
Buttons 0-9 can be assigned to any of the following MIDI controllers:
Continuous Controllers 1-31
Continuous Controllers 33-119
A-B
Toe
Tip
Ring
CH1-4
Start/Stop
Start
Stop
Continue
Reset
For additional information on all of these sources, refer toChapter 5Editing:FX
Parameters.
In FX Mode, transmitted values correspond to the state of the switch and are
indicated by the switch LEDs as follows:
Green = 127 transmitted
Off = 0 transmitted
Note that when used as a stand-alone controller, on and off are the only LED
indicators available. Note also that the LEDs for all of the buttons will remain in
their last toggled states.