Doepfer A-138M

Matrix Mixer

  • With 4 rows and 4 columns
  • Unipolar / Bipolar mode switchable on each column
  • Suitable for both control voltage and audio
  • Width: 20 HP
  • Depth: 20 mm
  • Power requirements: +30 mA (+12 V) / -30 mA (-12 V)

Further Information

Modul Type Mono
Width 20 TE / HP

This product is currently sold out

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19 Customer Ratings
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4.7 /5
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Did you know it can also work as a sequencer?
11.01.2016
What an essential and often overlooked module! Besides its obvious use for mixing audio and CV signals, Doepfer A-138M matrix mixer can also function as a sequencer: you can turn it into a 4 step chord sequencer (4 note chords!) or a 16 step traditional sequencer by adding a few additional modules. Feed gate outs 1-4 from either A-152 or A-161 into each respective input. Send each output to 1V/Oct inputs of your 4 VCOs. Play with a clock divider to find the right pace. Or do the same, but connect outputs into an A-151 and then into a VCO. Now you've got 16 steps! As always, very impressed with Doepfer.
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The heart of my sequencing rig
25.05.2016
This unit is exceptionally useful.
As a straight forward mixer, you can mix up to four signals and route them to four separate outputs, and each output can be set independently to sum the signals in a unipolar (positive voltage only) or bi-polar (positive and negative) fashion. Leaving the first input unplugged also allows you to add an offset to each output via the top row of knobs - very useful!
Where this unit comes into its own however is as a sequencer - you can create four separate sequences from the same input voltages - which can then be used to drive four oscillators to give some nice chords, or if you add an A-151 sequential switch (recommended!) you can create much longer and more complex sequences by switching between the outputs and sending them to one oscillator.

You can also mix LFOs / envelopes etc to create interesting and evolving modulation sources.
You can even (very carefully!) feed the outputs back into the mixer and use it for 'zero-input-mixer' music (disclaimer - feedback is tricky to control! Be careful!)

The usual high Doepfer standards apply here, the perfect blend of affordability and usability.
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Total
handling
features
quality
Awesome
spewie, 23.08.2020
Such an iconic module for CV mixing mangling in all manner of ways. In bipolar is hard to achieve 0 volts though in the unipolar mode O is more achievable, which would be my only criticsm although I have heard that achieving absolute 0 in a bipolar arrangement is intensely difficult and may not be a reasonable expectation of this module. You always get some bleed due to this problem which is not always an issue, sometimes annoying.
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handling
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Good module
exmojoao, 19.02.2020
Is a good sounding matrix mixer
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