4ms VCA Matrix Eurorack Module (Demo Video)

This is a demo of the newest Eurorack module from 4ms, the VCA Matrix – a playable 4×4 matrix of 16 VCAs.

Four CV or audio inputs can be routed in any amount/combination to four outputs, using the 16 CV control jacks, Level knobs, and Mute buttons.


  • 4 CV/audio inputs and 4 outputs (buffered and dc-coupled)
  • 16 VCA’s using high quality SSM chips (from unity gain to -100dB mute)
  • Playable surface with 16 latching Mute LED buttons, to mute each VCA individually (mute button disconnects Control jack and Level knob, and silences the VCA)
  • LED button brightness indicates sum of Control jack, Level knob, and Mute button
  • 16 Control jacks for VCA level control
  • 16 Level knobs attenuate the incoming Control signals. The control jacks are normalled to +5v, so if no control is plugged in, the knobs act as manual level controls
  • Matrix Expandability: VCA Matrices can be connected to form a larger matrix using headers on the back (4×8, 8×8, 12×4, etc)
  • Control Expandability: 16-pin header on back side of PCB allows an external device to control all VCAs: e.g. patch recall, patch sequencing, preset patterns such as quadrature panning, etc.
  • Suitable as a 4×4 mixer, splitter, as well as dynamic signal router/processor

Module size:

  • The VCA Matrix is 28HP, and approximately 1.5″ deep (38mm).

Power consumption:

A jumper selects using +5V from the power supply, or generating +5V on-board from the +12V rail.

  • -12V rail: 100mA max
  • +12V rail:
    • 75mA max with jumper selecting external 5V
    • 110mA max with jumper selecting internal 5V.
  • +5V rail:
    • 40mA max with jumper selecting external 5V
    • not used (0mA) with jumper selecting internal 5V.

Details at the 4ms site.

via bigcitymusic:

Here we are trying out the brand new 4ms VCA Matrix module. This module can do you so many things its hard to know where to start!

This patch is a fairly basic voltage router. Various LFO’s, slow, fast, and pitch-tracking are coming in on the left, the row labeled inputs, A B C D. The outputs, 1 2 3 4, are routed to different CV inputs on modules in our sequencer patch.

Output 1 goes to a filter cutoff, output 2 to delay time, output 3 to an oscillator pitch input, and output 4 to another filter’s cutoff. Then you can “play” your different routings! Slot 1C has a slow, squarewave LFO applied to it’s control input, and you can see the light flash when the square goes high.

This is only one example of what the MatrixVCA can do. You could use it as a patch storage/recall device enabling you to make modular presets. You could send fixed voltages into the inputs, creating playable sequences, The MatrixVCA also passes audio like a normal VCA. This can allow you to make some really complex patches. Kinda’ like a guitar pedalboard on steroids;) This is just the beginning…. This module is amazing!

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