Doepfer A-138P Performance Mixer

Modules A-138p/o are used to built a simple performance mixer (instead of an external stand-alone mixer). Module A-138p is the 4-fold input module, A-138o is the output module that can be combined with one or more A-138p.

A-138p features:

4 channels
controls and inputs for each channel
input (3.5 mm mono socket)
signal LED (as a coarse monitor of the incoming level, the level is measured after the gain control)
mute switch
gain (control to adapt different audio levels)
Level (the main volume control, linear response curve)
Aux
Pan
internal jumper for each channel to choose between Aux pre/post main Level control
internal connection to the output module and to other A-138p modules
A-138p requires A-138o (no stand-alone use)

A-138o (Expander) features:

level controls for Left, Right and Aux
output sockets for Left, Right and Aux (3.5 mm mono sockets)
A-138o requires at least one A-138p (no stand-alone use)
Application example for Aux Send and Aux Return: looping in another module for effects (e.g. DSP module A-187-1, BBD module A-188-1, Spring Reverb A-199)
Application example for Aux Send only: pre-listening in combination with the headphone amplifier module A-139-2