Doepfer A-138M

Please activate your javascript. You’re currently missing out on our lovely designed product gallery and its useful features (zoom into the very last pixel of each picture, 360 view, videos and more). We wouldn’t miss them for the world.

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)

30 30-Day Money-Back Guarantee

3 3-Year Thomann Warranty

available since December 2009

Item number 240112

sales unit 1 piece(s)

Modul Type Mono

Width 20 TE / HP

Show variations of this product

Doepfer A-138M

Doepfer A-138M Matrix Mixer * With 4 rows and 4 columns * Unipolar / Bipolar mode switchable on each column * Suitable f...

$131

to the product

110

Doepfer A-124 Wasp Filter SE

Doepfer A-124 Wasp Filter SE Wasp Filter * Special edition * Special 12 dB multimode filter * Circuit technology of the ...

$80

to the product

Doepfer A-160-2 Clock Divider II

Doepfer A-160-2 Clock Divider II Frequency Divider * For clock/trigger/gate signals * Width: 4 TE/ 4 HP / 20 mm...

$89

to the product

Doepfer A-138n

Doepfer A-138n Eurorack Module * Compact 4-channel mixer * Suitable for CV and audio signals * Volume control per channe...

$55

to the product

112

Doepfer A-180-2 Multiples

Doepfer A-180-2 Multiples Passive Multi-Port Distributor * 8x Interconnected jacks * Sockets are divided into 2x quadrup...

$31

to the product

Doepfer A-198 (Module + Manual)

Doepfer A-198 (Module + Manual) Trautonium Controller * Consists of Doepfer A-198 Module and Ribbon Controller * Ribbon ...

$189

to the product

Doepfer A-156

Doepfer A-156 Dual Quantiser The A-156 Module is a dual control voltage quantiser. A quantiser converts a continuous inp...

$109

to the product

Doepfer A-138n VE

Doepfer A-138n VE Eurorack Module * Vintage Edition with a black front panel * Compact 4-channel mixer * Suitable for CV...

$62

to the product

Doepfer A-138s VE Mini Stereo Mixer

Doepfer A-138s VE Mini Stereo Mixer Mini Stereo Mixer * Vintage Edition with black front panel * 4-in-2 Mix module in Eu...

$77

to the product

Doepfer A-178 Theremin

Doepfer A-178 Theremin Theremin Module * Produces variable control voltage when hand is moved around the antenna * Range...

$89

to the product

Doepfer A-124 Wasp Filter

Doepfer A-124 Wasp Filter Wasp Filter Module A-124 is a special 12 dB multimode filter using the "strange" filter circui...

$81

to the product

$131

The shipping costs are calculated on the checkout page.

Sales Rank

in Mixer, Attenuator Modules

This is what customers who viewed this product bought

Doepfer A-138s VE Mini Stereo Mixer

Intellijel Designs Mixup

$89

bought

Doepfer A-138s Mini Stereo Mixer

$72

22 Customer ratings

5 18 Customers 4 3 Customers 3 1 Customer 2 0 Customers 1 0 Customers

4.8 / 5

handling

features

quality

Review guidelines

14 Reviews

Did you know it can also work as a sequencer?

Anonymous 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.

Report

Do you believe this rating to be inaccurate or unacceptable for some reason? Please give us the reason for your assessment in the following text box and – if possible – your e-mail address for further questions.

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.

Report

The heart of my sequencing rig

Anonymous 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.

Report

This is the glue that holds your synth together!

Parasat 13.03.2023

Need F sends and returns? A 4 channel mixer? A pile of attenuverters? A feedback mixer? A modulation matrix? A performance controller? It’s all here, for one low, low price! You’ll be paralyzed by the possibilities!
Warning! Matrix mixers are addictive. Do not use under the influence of marketing hype.

Report

Read all reviews

Doepfer A-138M

Matrix Mixer

This is what customers who viewed this product bought

22 Customer ratings

14 Reviews

Smart Navigator

Recently Viewed Products

Shop and pay safely

Your benefits

Service

Served with love!

Doepfer A-138M

Matrix Mixer

This is what customers who viewed this product bought

Accessories & matching items

22 Customer ratings

14 Reviews

Compare options

Smart Navigator