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)
10 customer ratings:
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4.5 / 5.0
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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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Total

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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Show variations of this product
Doepfer A-138M
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Doepfer A-138M
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133 €

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...

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
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Standard VCO for Modular System A-100Module A-110-1 (VCO) is a voltage controlled oscillator. The A-110-1 produces frequencies in a range of about 8 octaves, of which four waveforms are available...

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Doepfer A-100 LC1 Low Cost Case
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Case for Eurorack Modules Integrated power supply A-100SSB: +12 V / 380 mA, -12 V / 380 mA, To 48 TE shortened A-100LC3 version, Built-in bus board with 8 module slots, Casing made of raw wood -...

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Frequency divider For clock/trigger/gate signals, Width: 4 TE/ 4 HP / 20 mm

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Doepfer A-180-3 Dual Buffered Multiple
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Doepfer A-180-3 Dual Buffered Multiple

Synthesizer module Double buffered 1-in-3 multiple, For buffering and duplication of CV and audio signals, Width: 4 TE / 4HP / 20.0 mm

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VCA Switchable characteristic between linear and exponential, Audio and CV signals can thus be optimally processed, Width: 8 HP, Depth: 50 mm, Power requirements: +30 mA (+12 V)/-30 mA (-12 V)

  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
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Noise/Random Voltage Generator Module A-118 is a noise and random voltage generator. It produces the following signals: white noise, coloured noise, and random voltage. White and coloured noise can...

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Voltage-Controlled Panning Module The A-134 is a voltage-controlled panning module. The module consists of 2 linear VCAs, which are inversely controlled by a control voltage, i.e., the more the...

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133 €
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Offers include 21% Belgium VAT and are valid as long as stocks last. Shipping costs to Belgium are 2,50 EUR, free shipping on orders above 49 EUR. Please click here for international Shipping rates. We do not accept liability for typographical errors or inaccurate information of any kind. *RRP = manufacturer's / distributor's recommended retail price in Germany
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