How Does It Work?#

VCA is a simple voltage-controlled amplifier: it scales an incoming audio signal with a manual gain setting and, when patched, a unipolar control voltage.

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Quick Overview#

• One audio input, one audio output, and one CV input.
• Gain sets the manual level.
• CV follows Eurorack-style unipolar semantics: 0V closes the VCA and 5V opens it fully.
• If no CV cable is present, the knob works as a plain manual level control.

Inputs And Outputs#

Port	Type	What It Does
In	Audio input	Signal to be amplified or attenuated.
CV	CV input	Unipolar level control. 0V is closed and 5V is fully open.
Out	Audio output	Final scaled signal.

Controls Reference#

Control	Range	Default	Behavior
Gain	0..2	1	Sets the base gain. With CV patched, the final gain is this value multiplied by the normalized CV.

Behavior Notes#

• With no CV cable connected, the module behaves like a manual gain stage.
• With CV connected, the module multiplies the knob setting by the normalized 0V..5V control signal.
• Negative CV does not invert the audio. It is clamped to the unipolar control range.
• The output stays audio-rate and follows the input exactly, just at a different level.