Lexicon MPX 100 User Manual
MPX 100 Dual Channel Processor
Stereo 44.1kHz S/PDIF Digital Output
User Guide
Unpacking and Inspection
After unpacking the unit, save all packing materials in case you ever need to re-ship. Thoroughly inspect the unit and packing materials for signs of damage.
Report any shipment damage to the carrier at once; report equipment malfunction to your dealer.
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 limits for a Class B computing device in accordance with the specifications in
Subpart J of Part 15 of FCC Rules, which are designated to provide 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 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.
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.
Acknowledgement
All product names indicated by a Trade Mark are registered by their respective manufacturers.
Lexicon Inc.
3 Oak Park
Bedford MA 01730 USA
Copyright 1998, Lexicon Inc.
All Rights Reserved.
Lexicon Part #070-11935
Telephone 781-280-0300
Fax 781-280-0490
Table of Contents
Getting Started .........................................................................1
Introduction............................................................................1
Front Panel Overview ............................................................2
Setting Audio Levels
Rear Panel Connections........................................................ 4
Audio Connections • Headphones • Footswitch
Basic Operation........................................................................7
Selecting Programs ............................................................... 7
Single Programs • Dual Programs • User Programs
Editing ................................................................................... 9
Tap Tempo Functions: Varying the rhythm • Audio
Tap • Setting Tempo via MIDI
Bypass.................................................................................11
Storing Programs................................................................. 12
System Mode .......................................................................... 13
System Mode Parameters ...................................................14
Bypass • Patching • Program Load • Digital Output
MIDI OUT/THRU • MIDI Pgm Change • MIDI Clock
Receive • Tempo • MIDI Dumps
Program Descriptions............................................................17
Single Programs ..................................................................18
Dual Programs..................................................................... 32
Special FX ........................................................................... 41
User Programs ....................................................................42
Restoring Factory Defaults
MIDI Operation........................................................................43
MPX 100 MIDI Behavior...........................................................43
Assigning a MIDI Channel for Program Load...........................44
Using Program Change Messages for Program Load
Learning Continuous Controllers..............................................46
Activating Bypass or Tap Functions with Program Change
Messages ............................................................................ 47
Clearing a Learned Assignment...............................................48
MIDI Clock................................................................................49
MIDI Dumps .............................................................................49
MIDI Implementation Chart ......................................................50
Specifications.........................................................................52
Introduction
Thank you for your purchase of the MPX
100 Dual Channel Processor.
The MPX 100 is a true stereo dualchannel processor with 24-bit internal processing, 20-bit A/D-D/A and S/PDIF digital
output. Powered by a new version of Lexicon’s
proprietary Lexichip™, the MPX 100 has 240
presets with classic reverb programs such as
Ambience, Plate, Chamber and Inverse, as
well as Tremolo, Rotary, Chorus, Flange,
Pitch, Detune, 5.7 second Delay and Echo.
Dual-channel processing gives you two independent effects in a variety of configurations: Dual Stereo (Parallel), Cascade, Mono
Split and Dual Mono.
A front panel Adjust knob allows instant
manipulation of each preset’s critical parameters and an Effects Lvl/Bal knob lets you
control effect level or the balance of dual
effect combinations. An easy Learn mode
allows MIDI patching of front panel controls.
In addition, tempo-controlled delays and
modulation rates lock to Tap or MIDI clock,
and Tap tempos can be controlled by audio
input, the front panel Tap button, dual
footswitch, external MIDI controller or MIDI
Program Change.
1
Getting Started
Other features include dual 2-stage
headroom indicators, a headphone output, a
software-selectable MIDI OUT/THRU port,
pushbutton or footswitch selection of dry or
muted audio output and a 20Hz-20kHz ±1dB
Frequency Response.
To make sure you get the most
out of the MPX 100, be sure to
read the manual.
Effects Lvl/Bal
Sets the level of the Single
effects and the balance of
the Dual effects.
Bypass
Mutes or bypasses the signal depending on the
setting of the System Bypass parameter. (Press for
2 seconds to access System Parameters.)
Adjust
Edit LED
Lights to indicate
program is altered
but not stored.
Modifies the parameters of the current
program.
Store
Initiates store procedure.
(When pressed with Tap, ac-
tivates MIDI Learn.)
PROGRAM
Selects program banks
(Single, Dual, or User).
Front Panel Overview
TAP
Flashes for tempobased programs. Press
twice to set a tempo.
Hold to have input level
determine tempo.
(When pressed with
Store activates MIDI
Learn.)
Input
Sets the level of the incoming
signal. LEDs indicate acceptable signal level (green), or
clipping (red).
Output
Controls the analog output level.
Mix
Controls the proportion of processed
(wet) to unprocessed (dry) signals.
VARIATION
Selects program variations for the effect bank currently selected by the PROGRAM knob (8 variations
for each Single effect and 16 variations for each Dual
effect). When PROGRAM is set to User, selects one
of 16 memory locations for user programs.
2
Setting Audio Levels
1. Start with INPUT set to 9:00 o'clock and
OUTPUT all the way down (fully counterclockwise).
2. Set the instrument output or effects send
being input to the MPX 100 to a nominal
level and play, or send audio to the MPX
100. The Level LEDs* should light green.
If the Clip LEDs light red at this point, turn
down the output of the instrument or
effects send until the Clip LEDs remain
off during the loudest passages.
3. While still sending audio to the MPX 100,
gradually turn up the INPUT control until
the Clip LEDs show red on only the
loudest peaks.
4. Set the MIX control to Dry.
5. Turn OUTPUT to the desired level.
6. If the MPX 100 is using a console’s sends
and returns, set the MIX control fully
clockwise (100% wet). If you are using an
instrument amplifier, start with MIX set
halfway up.
* The Level LEDs are off when the incoming signal
is low (more than 30dB below overload). The Clip
LEDs light red when the signal approaches overload (-2.5dB). Acceptable signals will cause the
Level LEDs to light green almost continuously,
with the Clip LEDs flashing red on peaks.
3
As with any audio product, it is good
practice to first power on all outboard
gear, then the mixer, then any loudspeakers.
MIDI
Two 5-pin DIN MIDI connectors
are provided for MIDI IN and software selectable MIDI OUT/THRU.
POWER
Use Lexicon 9VAC power pack.
DIGITAL OUTPUT
RCA S/PDIF connector.
Rear Panel Connections
OUPUT
Single-ended (unbalanced) stereo outputs provide +8dBu
typical output level. Use the right output connector for mono
output. If no connection is made at the right output, the left
output can be used to drive headphones at modest volume.
FOOTSWITCH
1/4" TRS connector, for momentary contact footswitch, allows footswitch control
of front panel Tap and Bypass functions.
INPUT
Single-ended (unbalanced) inputs accept levels
as low as -30dBu. Input impedance is 500 kΩ. Use
the right input for mono sources. Can be used as
direct input for guitar.
4
Audio Connections
Audio connections to the MPX 100 are
unbalanced and should be made with high
quality shielded cables with 1/4" tip-sleeve
phone plugs at the MPX 100 end.
The MPX 100 produces effects from either
mono or stereo sources. With mono sources,
the dry signal appears, along with audio effects, at both outputs. For instruments and
sources with stereo outputs, use both inputs.
We recommend using the outputs in stereo
whenever stereo inputs are used, but if mono
output is required, use the right output jack.
The left and right signals are summed internally when only the right output is used.
Headphones
A stereo signal which is adequate to drive
headphones is available at the left output
(provided no connections are made through
the right output). This feature is provided as
a convenience for practice purposes, and is
intended to provide only modest volume.
5
Footswitch
A footswitch connected via the rear-panel
footswitch jack allows control of Tap and
Bypass. A momentary footswitch can be
wired to a tip-ring-sleeve connector. A stereo
Y-connector allows two identical single
switches to be used.
Power off the MPX 100 before plugging in
the footswitch. (Otherwise, Bypass will be
enabled.)
A dual-function footswitch with a set of labels
to identify footswitch functionality (Tap and
Bypass) is available from Lexicon dealers.
Connecting to a Balanced Console
The MPX 100 can be used as two independent Effects Processors with Dual Program
Variations 11-16. Designate two auxiliary
sends on your console and connect one to
the left MPX 100 input, and the other to the
right input. Refer to the Program Descrip-
Modes of Operation
tions to take advantage of this configuration.
Mono Guitar Input with
Mono or Stereo Amplifiers
Dual Processor Setup with a Console
6
Selecting Programs
Basic Operation
All of the programs on the MPX 100 are
selected with the front panel PROGRAM and
VARIATION knobs.
The PROGRAM knob selects Single or
Dual program banks. The VARIATION knob
selects different program versions.
The Single selections are arranged
around the left side of the PROGRAM knob;
the Dual selections and the User bank are
arranged around the right side of the knob.
Single Programs
When a Single program is selected, turning the VARIATION knob to positions 1-8 will
load eight versions of the first effect; positions 9-16 will load eight versions of the
second effect.
For example, when Plate, Gate is selected, VARIATION 1-8 will load eight different Plate programs; VARIATION 9-16 will
load eight different Gate programs.
When Special FX is selected, the VARIATION knob will load 16 different programs
(one at each knob position).
7
Use the PROGRAM knob to
select the Single, Dual or
User effect you want.
Turn VARATION to
select one of 16
programs.
Dual Programs
When one of the Dual Programs is selected, the VARIATION knob will load 16
different programs, each containing two effects.
User Programs
When User is selected with the PROGRAM knob, VARIATION selects 16
memory locations available for storing your
own programs.
(When shipped, User variations 1-16
contain duplicates of a selection of the factory-installed programs.)
8
Editing
Editing MPX 100 programs is easy. We've
arranged the critical parameters of each
program under the front panel Adjust knob,
so all you have to do is turn the knob to adjust
the program to suit you.
You can also adjust the level of the Single
programs, or the Effects Balance of the Dual
programs with the Effects Lvl/Bal knob.
Changes made with either knob are recognized as edits, and will cause the front
panel Edit LED to light to alert you to the fact
that the program has been altered.
Use Adjust to
edit the current
program.
Turn Effects Lvl/Bal to
adjust the level of a
Single program...
The Edit LED will light to show
that the program has been
altered from its stored state.
...or the balance of the
two effects in a Dual
program
9
Tap Tempo Functions
Varying the Rhythm
The MPX 100 Tap Tempo feature allows you to set the delay times and modulation rates of tempo-based programs to the
beat of the music.
To set the tempo from the front panel,
simply press the Tap button twice in time with
the music. That’s your tempo. No more dialing up what “could be” the delay time in
milliseconds — just tap twice — the MPX 100
will figure out the time for you. When you
want to change tempo, just tap twice again in
the new rhythm.
The Tap LED will flash whenever
a tempo-based preset is loaded.
Audio Tap
You can also use audio input to set the
tempo of the MPX 100 delay times.
1. Press and hold the Tap button for two
seconds. (The optional dual footswitch
lets you press and hold Tap without
taking your hands off your instrument. )
2. While holding down Tap, play 2 short
notes in rhythm, then release the Tap
button.
3. The MPX 100 automatically calculates
the tempo from the space between your
two notes.
For live performances this is a must — an
easy way to set delay rates to follow your
rhythm.
10
Many factory programs are stored with
their own tempo rate. You can tap in a new
tempo (and store your version in a User
location) or set the MPX 100 to always recall
the last tempo used and apply it to every
program. (See System Mode.)
When you select Global Tempo from the
MPX 100 System mode, the last tempo
tapped in will be applied to all programs with
tempo-controlled parameters. (You will know
if a program is tempo-controllable because
the Tap button LED will flash when the program is loaded.)
Setting Tempo via MIDI
When used in conjunction with the Learn
feature, Tap can be set remotely from any
MIDI device. MIDI controllers, such as
Lexicon's MPX R1 Foot Controller, can be
used to send Continuous Controller messages or Program Changes to the MPX 100
or you can send Continuous Controller or
Program Change messages from the button
and fader moves of many mixing consoles.
The MPX 100 will Learn these messages
and allow you to set tempo via MIDI.
The MPX 100 can also receive and
utilize MIDI Clock. So, when used with a
MIDI sequencer or drum machine, the
MPX 100 automatically adjusts its internal
tempo to match. (See MIDI Operation.)
11
Bypass
Pressing the front panel Bypass button
will cause the MPX 100 to pass only dry,
unprocessed audio, or to mute the inputs to
the current effect.
Bypass can be set to mute or
bypass effects.
A System Mode parameter determines
which of these two options is in effect. (See
System Mode.) Bypass functions can also
be activated by footswitch or via MIDI.
Storing Programs
When you want to save a program,
press Store. The Store LED will flash slowly
to indicate that the MPX 100 store function is
armed. (If you want to exit without saving the
current program, press Store again.)
Turn the PROGRAM knob to User, then
use VARIATION to select one of the 16 User
locations.
Press Store again to save your program
to the selected location (and overwrite the
program previously stored there). The Store
LED will flash rapidly while the store operation is completed. The store operation is
complete when the LED stops flashing and
turns off. The Edit LED will also turn off, as
the current program is now your saved version.
Press Store.
Turn PROGRAM to User and use
VARIATION to select a User location.
The Store LED will
flash slowly.
Press Store again.
The Store LED will flash rapidly
while the store operation is
completed.
12
System Mode
System parameters and MIDI dumps
are activated in System mode. To enter this
mode, press and hold Bypass for approximately 2 seconds. The Bypass and Store
LEDs will blink slowly to indicate you are in
System mode.
The adjustable parameters available in
this mode are shown in the chart on the
following page.
Turn the VARIATION knob to select a
parameter. Press Store to toggle the state of
the parameter, or to execute a MIDI dump.
The Edit LED will show the current state of
each parameter.
13
When you have finished editing parameters and are ready to resume normal operation, return the VARIATION knob to its prior
setting, or you will load a new program based
on its position when you exit System Mode.
(The Tap LED will light when VARIATION
matches its prior setting.)
To exit System Mode, Press Bypass. If
you have changed any System parameters,
the Store LED will flash rapidly.
Press and hold Bypass
for 2 seconds...
...The Bypass and Store
LEDs will blink slowly to
indicate you are in
System mode.
Turn VARIATION to select a parameter.
Press Store to
toggle the
parameter state
(or to execute a
MIDI dump).
System Mode Parameters
Variation State when Edit LED is:
Setting Parameter On Off
1 Bypass Mute Bypass*
2 Patching Disabled Enabled*
3 Program Load Mute Bypass*
4 Digital Output Dry Wet*
5 MIDI OUT/THRU Out* Thru
6 MIDI Pgm Change Disabled Enabled*
7 MIDI Clock Receive Disabled Enabled*
8 Tempo Program* Global
MIDI Dumps (Press Store to Transmit)
14 Dump User Programs
15 Dump Current Program
16 Dump System and Learned patches
* Factory Default
System
parameters
MIDI
Dumps
Turn VARIATION until the Tap LED goes on
to find the last loaded program...then press
Bypass to exit System Mode.
14
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