Definition: When mixing live sound, you're bound to run into a board with VCAs. VCAs, or Voltage Control Amplifiers, are a simple way to manage multiple channels with a single fader.

VCAs work by regulating the fader output voltage individually, instead of routing all the analog channels to one group, as with a subgroup.

The main advantage of using a VCA to mix is that a single fader can control multiple channels, even stereo or stereo-linked channels.

Also Known As: VCA, VCF