A-138p

Performance Mixer Input Module

Module A-138p is the 4-fold input module,

4 channels
controls and inputs for each channel
input (3.5 mm mono socket)
mute switch
gain (control to adapt different audio levels)
Level (the main volume control)
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

http://www.doepfer.de/A138p.htm