Doepfer - A-138m 4x4 Matrix Mixer

The Doepfer A-138m is a versatile 4x4 matrix mixer, capable of routing and blending up to four audio or CV signals across four outputs in countless combinations. Each input channel is routed to each output via dedicated knobs, giving you full control over signal distribution.

Each column of controls can be set to operate in either unipolar mode (as attenuators) or bipolar mode (as polarizers), allowing for both positive and negative mixing. A handy jumper setting enables the top row to act as offset generators when no cable is patched in — a great way to inject adjustable CVs directly into your patch.

A powerful utility module for CV shaping, signal routing, feedback mixing, and more.

• 4x4 matrix mixer for CV/audio

• Unipolar (attenuator) or bipolar (polarizer) operation

• Adjustable offset via top row (jumper-selectable)

• Ideal for modulation blending and signal routing

• Width: 20HP