4ms/vca-matrix
VCA Matrix
A playable 4x4 matrix of 16 SSM VCAs. Four DC-coupled CV/audio inputs can be routed in any amount and combination to four DC-coupled outputs. Each of the 16 crosspoints has its own CV control jack, level knob, and latching mute LED button.566
Capabilities 5
- Attenuatorattenuator
- VCA matrix mixer — manual level controls attenuate each routed signal.
- Matrix Mixermatrix-mixer
- 4x4 matrix of 16 VCAs; any input can be routed in any amount to any output via individual CV control jacks, level knobs, and mute buttons at each crosspoint.566
- Mixermixer
- Each output sums the contributions of all four inputs through their respective row VCAs; can be used as a standard 4x4 mixer.566
- Signal Switchsignal-switch
- 16 latching mute LED buttons disconnect the control jack and level knob and fully attenuate each VCA crosspoint independently.566
- Voltage-Controlled Amplifiervca
- 16 crosspoint VCAs using SSM chips with exponential response at low CV and pseudo-log (soft-limit) response at higher CV.566
Jacks 24 (20 in / 4 out)
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (20) | |||
| Control A-1 | cv | ≥-2.75V | CV control input for crosspoint A-1 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched. 0V yields ~-54dB; 4.4V yields unity gain.566 |
| Control A-2 | cv | — | CV control input for crosspoint A-2 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control A-3 | cv | — | CV control input for crosspoint A-3 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control A-4 | cv | — | CV control input for crosspoint A-4 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control B-1 | cv | — | CV control input for crosspoint B-1 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control B-2 | cv | — | CV control input for crosspoint B-2 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control B-3 | cv | — | CV control input for crosspoint B-3 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control B-4 | cv | — | CV control input for crosspoint B-4 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control C-1 | cv | — | CV control input for crosspoint C-1 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control C-2 | cv | — | CV control input for crosspoint C-2 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control C-3 | cv | — | CV control input for crosspoint C-3 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control C-4 | cv | — | CV control input for crosspoint C-4 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control D-1 | cv | — | CV control input for crosspoint D-1 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control D-2 | cv | — | CV control input for crosspoint D-2 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control D-3 | cv | — | CV control input for crosspoint D-3 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Control D-4 | cv | — | CV control input for crosspoint D-4 VCA. Signal is attenuated by the Level pot. Normalled to 4.5V via internal ribbon cable when nothing is patched.566 |
| Input A | mixed | — | DC-coupled buffered signal input A. Accepts audio or CV. Drives all four column VCAs in row A.566 |
| Input B | mixed | — | DC-coupled buffered signal input B. Accepts audio or CV. Drives all four column VCAs in row B.566 |
| Input C | mixed | — | DC-coupled buffered signal input C. Accepts audio or CV. Drives all four column VCAs in row C.566 |
| Input D | mixed | — | DC-coupled buffered signal input D. Accepts audio or CV. Drives all four column VCAs in row D.566 |
| Outputs (4) | |||
| Output 1 | mixed | — | DC-coupled output 1. Sums the contributions of all four row inputs through their respective column-1 VCAs.566 |
| Output 2 | mixed | — | DC-coupled output 2. Sums the contributions of all four row inputs through their respective column-2 VCAs.566 |
| Output 3 | mixed | — | DC-coupled output 3. Sums the contributions of all four row inputs through their respective column-3 VCAs.566 |
| Output 4 | mixed | — | DC-coupled output 4. Sums the contributions of all four row inputs through their respective column-4 VCAs.566 |
Parameters 33
| Name | Type | Range | Behavior |
|---|---|---|---|
| 5V Source Select | jumper | — | Selects whether the module's 5V supply comes from the rack's +5V rail (EXT) or is generated internally from the +12V rail (INT). Set to EXT when the power supply provides +5V; set to INT otherwise.566 |
| Level A-1 | knob | — | Attenuates the incoming Control CV for crosspoint A-1. When nothing is plugged into the Control jack, acts as a manual level control for the VCA. At minimum, provides ~-55dB attenuation (LED dim but not off).566 |
| Level A-2 | knob | — | Attenuates the incoming Control CV for crosspoint A-2. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level A-3 | knob | — | Attenuates the incoming Control CV for crosspoint A-3. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level A-4 | knob | — | Attenuates the incoming Control CV for crosspoint A-4. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level B-1 | knob | — | Attenuates the incoming Control CV for crosspoint B-1. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level B-2 | knob | — | Attenuates the incoming Control CV for crosspoint B-2. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level B-3 | knob | — | Attenuates the incoming Control CV for crosspoint B-3. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level B-4 | knob | — | Attenuates the incoming Control CV for crosspoint B-4. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level C-1 | knob | — | Attenuates the incoming Control CV for crosspoint C-1. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level C-2 | knob | — | Attenuates the incoming Control CV for crosspoint C-2. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level C-3 | knob | — | Attenuates the incoming Control CV for crosspoint C-3. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level C-4 | knob | — | Attenuates the incoming Control CV for crosspoint C-4. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level D-1 | knob | — | Attenuates the incoming Control CV for crosspoint D-1. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level D-2 | knob | — | Attenuates the incoming Control CV for crosspoint D-2. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level D-3 | knob | — | Attenuates the incoming Control CV for crosspoint D-3. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Level D-4 | knob | — | Attenuates the incoming Control CV for crosspoint D-4. When nothing is plugged into the Control jack, acts as a manual level control for the VCA.566 |
| Mute A-1 | button | — | Latching mute button for crosspoint A-1. When muted, disconnects the Control jack and Level knob and fully attenuates the VCA to -100dB. LED brightness tracks gain level and instantaneous CV. Muting turns LED completely off.566 |
| Mute A-2 | button | — | Latching mute button for crosspoint A-2. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute A-3 | button | — | Latching mute button for crosspoint A-3. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute A-4 | button | — | Latching mute button for crosspoint A-4. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute B-1 | button | — | Latching mute button for crosspoint B-1. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute B-2 | button | — | Latching mute button for crosspoint B-2. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute B-3 | button | — | Latching mute button for crosspoint B-3. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute B-4 | button | — | Latching mute button for crosspoint B-4. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute C-1 | button | — | Latching mute button for crosspoint C-1. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute C-2 | button | — | Latching mute button for crosspoint C-2. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute C-3 | button | — | Latching mute button for crosspoint C-3. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute C-4 | button | — | Latching mute button for crosspoint C-4. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute D-1 | button | — | Latching mute button for crosspoint D-1. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute D-2 | button | — | Latching mute button for crosspoint D-2. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute D-3 | button | — | Latching mute button for crosspoint D-3. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
| Mute D-4 | button | — | Latching mute button for crosspoint D-4. Disconnects Control jack and Level knob and fully attenuates VCA when muted. LED brightness tracks gain.566 |
Firmware history 0 versions
No firmware history recorded.
References 2
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[567]
4ms VCA Matrix (VCAM) product pageproduct_page● verified 2026-05-20