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A VCA (voltage-controlled amplifier) is a module that allows users to control the amplitude or volume of an audio signal using a control voltage. VCAs are commonly used to shape the dynamics of a sound, such as creating volume swells or controlling the level of a sound in response to changes in another signal.

VCAs typically have an input jack for the incoming signal, a control voltage input jack, offset control, and an output jack for the processed signal.