Doepfer — A-130-1

Doepfer A-130 / A-131 VCA — Cheat Sheet

A-130: Linear voltage-controlled amplifier (VCA), best for control voltages.
A-131: Exponential VCA, best for audio signals.
Both modules are otherwise functionally identical (jacks and knobs).

Label	Function	Range
Gain	Overall gain (offset) control	0–10
CV2	Attenuator for CV 2 (modulates amount of CV2 applied)	0–10
In 1	Attenuator for Audio In 1	0–10
In 2	Attenuator for Audio In 2	0–10
Out	Attenuator for output signal (audio level out)	0–10

CV1 and CV2 are summed; +5 V = max amplification, 0 V = closed. CV2 has an attenuator, CV1 does not.

A-130: Linear response (best for control voltages).
A-131: Exponential/logarithmic response (best for audio for natural loudness perception).

For audio signals: Use exponential mode (A-131).
For CV/modulation: Use linear mode (A-130).
Gain Control: At 0, no signal passes (unless CV present). Increase for baseline amplification or when using bipolar CV sources.
CV Inputs: Bring envelope generators or LFOs to CV1/CV2. For maximum VCA response use up to +5 V.
Distortion: If output distorts, lower In 1/In 2 attenuators.
Output Level: Adjust Out attenuator to set final module volume.

Use the front panel diagrams to log your settings and favorite patches with marker.

Manual Reference: Doepfer A-130/A-131 VCA Manual (PDF)
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