VCAs are absolutely essential in a modular system, for example for Shaping the amplitude or timbre of a tone with an envelope. Animating a mixture of several oscillators. Controlling the amount of filter modulation with a random source or a touch controller. Applying an envelope on the linear FM signal hitting an oscillator
Gain scale a 5V CV translates to a gain of 1 0dB , both in linear and in exponential mode.
Gain range maximum gain of 2 6dB in linear operation, 10 20dB in exponential operation.