4CHAN M – 4 Channel Stereo Mixer for Eurorack Synthesizer

4CHAN M, “M” stands for Mix.

It´s a 4 channel mono to stereo mixer with two mono sends, two stereo returns, panning, external stereo or mono to stereo input and plenty of level control.

The overlay and signal flow is leaned on common line mixers without the EQ section.

The typical output level / Vpp depends on the level you feed and how you boost or atttenuate the incoming signal.

In technical words the unit gives 10Vpp output when working around unity gain.

The only spot where you can boost the signal is the “Gain” or the “Return”. Gain gives a boost of factor 1:4, Return a factor of 1:3.

Else you will always stay in unity gain when all pots are open.

This way you can handle line & euroack levels pretty easy with finding your personal sweet spots.

The channel pots and the master pot are illuminated to give some basic but stylish level feedback.

The master LEDs can be used as a kind of clipping indicator when leveled well 😉

The External In and Returns are normalized to “Stereo”

This means if you just plug a mono signal into input L the signal gets splitted and becomes “pseudo Stereo”.

The Returns work fine as stereo inputs as well by the way 😉

The external in comes in without attenuation and goes straight onto the main bus.

On the backside is a 1×3 pin header for DIYers to extend channels 🙂 (10k already placed)

Check the following diagram to get a better understanding of the signal flow.


Depth: 30mm (powered)

+12V 48mA

-12V 45mA