Doepfer A-138m Matrix Mixer

4x4 matrix mixer for flexible signal routing

20 HP Eurorack module

The A-138m by Doepfer is a 4x4 matrix mixer that allows any combination of 4 inputs to be routed to 4 outputs with independent level control at each junction. With 16 attenuator knobs arranged in a grid, it provides complete signal routing flexibility for audio or CV signals. It is an essential utility for complex patches requiring flexible signal distribution and mixing.

Features

• 4 signal inputs
• 4 mixed outputs
• 16 level controls in a 4x4 matrix
• Route any input to any output independently
• Works with both audio and CV signals
• Passive attenuation at each crosspoint

Controls & Jacks (28)

• Mix 1A— Mix level of Input 1 to Output A
• Mix 1B— Mix level of Input 1 to Output B
• Mix 1C— Mix level of Input 1 to Output C
• Mix 1D— Mix level of Input 1 to Output D
• Mix 2A— Mix level of Input 2 to Output A
• Mix 2B— Mix level of Input 2 to Output B
• Mix 2C— Mix level of Input 2 to Output C
• Mix 2D— Mix level of Input 2 to Output D
• Mix 3A— Mix level of Input 3 to Output A
• Mix 3B— Mix level of Input 3 to Output B
• Mix 3C— Mix level of Input 3 to Output C
• Mix 3D— Mix level of Input 3 to Output D
• Mix 4A— Mix level of Input 4 to Output A
• Mix 4B— Mix level of Input 4 to Output B
• Mix 4C— Mix level of Input 4 to Output C
• Mix 4D— Mix level of Input 4 to Output D
• Input 1— Signal input 1
• Input 2— Signal input 2
• Input 3— Signal input 3
• Input 4— Signal input 4
• Output A Mode— Switches Output A between unipolar and bipolar operation
• Output A— Mix output A
• Output B Mode— Switches Output B between unipolar and bipolar operation
• Output B— Mix output B
• Output C Mode— Switches Output C between unipolar and bipolar operation
• Output C— Mix output C
• Output D Mode— Switches Output D between unipolar and bipolar operation
• Output D— Mix output D

Explore the interactive A-138m Matrix Mixer panel on BleepDex — tap any control to learn what it does.