VCA is short for “voltage-controlled amplifier,” and for all intents and purposes, you can think of it as the automated volume knob the controls the amplitude of each note played. It has a number of mod sources, but is primarily controlled by either the ADSR or AR envelope generator.
VCA Modulation Sliders
ADSR- Sets the amount of modulation of amplitude via the ADSR envelope generator.
AR- Sets the amount of modulation of amplitude via the AR envelope generator.
LFO- Sets the amount of modulation of amplitude via the low-frequency oscillator. This useful for tremolo-type effects.
Velocity (Vel)- Sets the amount of amplitude modulation via keyboard velocity. Higher slider settings lower the initial amplitude, and playing harder = louder notes.
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Layer Volume- Sets the volume for the currently selected layer. This is useful for balancing volume levels when using the Double or Split modes.
Layer Pan- Sets channel panning for the currently selected layer. This is useful for panning layers when using the Double or Split modes.