The VCA (voltage-controlled amplifier) is the busy person’s way of controlling multiple signals. Take four channels and send their signal to one fader. Every time you increase the volume of that group fader, the group control sends a message back to those channels so each channel increases the volume coming out of it. A VCA is more like a remote control.And if that’s not enough, let’s add in the DCA. The DCA (digital-controlled amplifier) works much like it sounds; instead of altering the actual signals from the channels, they are processed in the same way which then leads to increased or decreased volume.
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