Control all 8 Auxiliary Return and all 4 Stereo Effects Return Levels in your Mix Bus Control all Channel Send Levels for Inputs 1 – 32 in your Mix Bus Indication of stereo-linked channels and monitor buses Choose the target mix bus for monitoring Nick-name your MCA selection for intuitive overview on stage MCAs allow concurrent trimming of all assigned channels' signal levels with just one fader: -more me-less band-more click track-less percussion.