The A-138i Interrupting Mixer from Doepfer is a 6TE narrow mixer module, which is equally suitable for audio signals and control voltages. Each input has its own attenuator and can be deactivated using the toggle switch. If a cable is plugged into the Single Out A socket, the corresponding channel is disconnected from the main output. Single Out B is reserved for inputs 1 and 2 only and acts as an attenuator for both channels when used. The output of the mixer is doubled and therefore acts as a mini- Multiple .