Module A-138-6(1U) is a mixer with 6 inputs and the feature to route each input to one of the two outputs or to both outputs.
The module is equipped with these controls, inputs and outputs:

6 inputs (sockets In 1...6)
6 level controls (Level 1...6), linear characteristic
6 toggle switches (Assign) for the assignment of each input to the two outputs:

• switch in left position: channel 1
• center position: both channels
• switch in right position: channel 2

2 outputs (sockets Out 1 and Out 2)
All sockets are monophonic.