Lexicon MPX 100 Product Introduction

Lexicon Inc. • 3 Oak Park • Bedford MA 01730 USA • Telephone 781-280-0300 • Fax 781-280-0490
APPLICATION NOTE
MPX 100 Dual Channel Processor
Stereo 44.1kHz S/PDIF Digital Output
MIDI Learn
The MPX 100 offers a powerful, easy to use, remote editing feature called Learn which allows you to
remotely control as many as 5 of the front panel controls. By sending standard MIDI Continuous
Controller or Program Change messages to the MPX 100, you have complete control over the wet-to-
dry Mix ratio, Effects Level or Balance, Bypass, Tap, or the primary aspect of the preset — the Adjust
knob.
To use Learn:
1. Simultaneously press Tap and Store.
2. Move Mix, Effects Lvl/Bal, Adjust, Bypass or Tap to assign it to a MIDI controller. For this example,
we'll move Mix.
3. Now, send a controller message to the MPX 100. For this example, we'll move the Mod Wheel on
a connected MIDI keyboard. The Edit LED will flash to show MIDI activity.
4. Press Store. The embedded Store light will flash rapidly.
5. Press Tap and Store simultaneously to exit. (To clear, repeat without sending a MIDI message.)
In our example, we now have Mod Wheel control over the MPX 100 wet/dry Mix. As the effect of Learn
is global, the Mix ratio of every MPX 100 program can now be controlled by the Mod Wheel.
When used with a MIDI device, such as the Lexicon MPX R1 MIDI Remote Controller, all 5 front panel
controls can be adjusted and every preset can be loaded remotely. The MPX 100 will also Learn the
individual MIDI Channels associated with each controller. This means that it can operate on up to 6
different MIDI channels (one for loading presets and 5 for the front panel controls), allowing you to use
it with multiple MIDI devices.
As a gigging musician, you never have to touch the front panel during a live performance. In a MIDI
studio, the controls can be automated and recorded into any sequencing software allowing for complete
automation of MPX 100 presets.
A System mode parameter allows you to disable and enable Learn. This lets you temporarily turn off
Learned controllers without having to clear them.
Front panel controls and the control sources which can be Learned:
Control sources
MIDI
Front Panel control MIDI Controller Program Change Footswitch
Mix X
Effects Lvl/Bal X
Adjust X
Bypass X X X
Tap X X X

Lexicon MPX 100 Specifications

Audio Inputs and Outputs

audio input level	-30dBu to +4dBu
audio input impedance	500K unbalanced
audio output level	+8dBu typical
audio output impedance	75Ω for Headphone output

Digital Audio

digital audio output	20-bit Digital S/PDIF
sample rate	44.1kHz
conversion	20 bits A/D, 20 bits D/A

Frequency and Distortion

frequency response	20Hz-20kHz, ±1dB
thd+n	<0.05%, 20Hz-20kHz
dynamic range A/A	>95dB typical, 20Hz-20kHz, unweighted
dynamic range A/D	>100dB typical, 20Hz-20kHz, unweighted
crosstalk	45dB

Power and Environment

power requirements	9VAC wall transformer
operating temperature	32° to 104°F (0° to 40°C)
relative humidity	95% non-condensing

Weight and Dimensions

dimensions	19"W x 1.75"H x 4"D (483 x 45 x 102mm)
weight	2 lbs, 2 oz (0.959kg)
internal audio data path	DSP: 24-bit