CONTROL AND / OR MIXING SURFACE Touch sensitive control surface with motorized faders. Proprietary Mackie communication protocol. Motorized 100mm Penny Faders + Touch Sensitive Optical Giles. More than 50 dedicated buttons for fine parameter control. Cassette player style transport buttons. Backlit display with track names and parameters. Quick cursor buttons up, down, right, left and zoom. Built-in USB MIDI interface for direct connection to Mac or PC with up to 3 additional MIDI devices. Expandable with Mackie Control Extender Pro and C4 pro.