MOTM

While I don't own an MPX-1 myself, as far as I can remember, it has
both input and output level knobs, and -10/+4 switches in the back.
So I don't think you would need any any sort of I/O module.  Also,
considering that the MPX-1 can send most of its internal mod sources
as MIDI data, you could use it with a MIDI-->CV converter to create
LFO's, envelope followers, etc.

Anyway, it wouldn't be too difficult to build a 1U triple preamp.
Just put an attenuator before an op-amp, then you would have
adjustable gain from "negative infinity" to whatever you gain set the amp
(eg. 15-20 dB).  You could build it on a MUUB, MOTM breadboard, etc.
You could even use an Oakley multimix panel if you didn't mind the
knobs being labeled wrong.

On 9/19/07, Richard Brewster put forth:
>Great!  Thanks.  I get stuck in a rut or two myself.
>
>About this suggestion by Robert:  I use a Lexicon MPX-1 to add effects
>through my external mixer send and return.  Great idea to take the MPX-1
>output and feed it back into the MOTM.  But it is at line level.  I
>don't have an external input module yet.  This looks like another DIY
>project.  Blacet has an input module with envelope follower, but I want
>a stereo unit.  Ideas?