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)
  • 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 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)
• Anwendungsbeispiel für Aux Send only: pre-listening mi combination with the headphone amplifier module A-139-2