1 CROSSFADERBlends audio between left and right mixer channels2 VOLUMEAdjust the Volume of each mixer channel.3 CUE CROSSFADERBlend the pre-fader audio signal from Left and Right mixer channels to the Headphones Output. When set to far left, only the Left channel will be heard in Headphones and when set to far right, only the Right channel will be heard to Headphones4 CUE MIXBlends the audio that's being sent on the headphones channel between the headphones signal (far left) and the Master output signal (far right).5 CUE LEVELAdjusts the volume of the headphones channel.6 EQ LOWAdjust the low (bass) frequencies of left/right mixer channel.7 EQ MIDAdjust the mid (middle) frequencies of left/right mixer channel.8 EQ HIGHAdjust the high (treble) frequencies of left/right mixer channel.9 LP/HP FILTERApply a Low/High-pass Filter to left/right mixer channel. When centered, no Filter is applied.10 LEVELAdjusts the audio level (gain) of left/right mixer channel.11 SOURCE SELECTSelect the input source of Left/Right mixer channel. Put the switchers to USB A or USB B position for sending Left/Right VirtualDJ Deck to Left/Right mixer channels.12 MAIN LEVELAdjusts the volume of the Master output of the device (connection at the rear panel).13 BOOTH LEVELAdjusts the volume of the Booth output of the device (connection at the rear panel).14 SESSION INAdjusts the volume of the incoming signal on "Session" input on the rear panel of the device.15 SESSION OUTAdjusts the volume of the "Session" output (connection at the rear panel of the device).16 SESSION CUEWhen enabled, sends the signal of the "Session" input to the headphones channel for pre-listening..17 MIC LEVELAdjust the volume of the Microphone 1 input (connection at the rear panel of the device)18 MIC TONEAdjust the tone (single band equalizer) of the Microphone 1 input (connection at the rear panel of the device)19 MIC ONTurn on/off the signal of the Microphone 1 input (connection at the rear panel of the device)20 MIC ECHOApplies an Echo effect on the Microphone 1 input
Please note that all these operations are hardware operated, but the movement of some of them will be visible in VirtualDJ GUI.