The Doepfer A-138i is a clever and compact 4-channel mixer with per-channel mute switches and flexible routing options—ideal for both audio and CV duties in a tight setup.

Each of the four inputs includes an attenuator and a mute switch. The module offers two mix outputs and individual outputs for each channel, with two output modes:

• Single Output A: Removes the channel from the mix output when patched

• Single Output B (Channels 1 & 2): Leaves the channel in the mix when patched

This dual output behavior lets you process signals individually or split them to multiple destinations without disrupting your main mix. The A-138i is DC-coupled, making it equally suitable for audio and control voltages.