Volume knob: Set the selected zone output level. This parameter is also useful for level-matching multiple selected zones.
Tune knob: Tune the zone in semitone increments.
Pan knob: Determine the left/right pan position for each zone or the left/right balance for a stereo zone.
Lo Key field: Drag vertically or use the arrows to set the lowest MIDI note that triggers the zone. Alternatively, drag the left edge of the highlighted zone in the keymap editor. See PDF
Control Surfaces Support Guide: PDF