ProjectMix I/O gives the user eight analog input channels that feature ¼" balanced and XLR microphone inputs with individual mic/line switches. Phantom power is provided for up to eight condenser mics and input 1 features a front-panel instrument input so the user can plug a guitar or bass right in. 8 x 8 ADAT Lightpipe I/O brings the simultaneous input total to 16 and allows the user to expand their system with devices like M-Audio's award winning Octane preamp. This allows for eight more channels of preamp via Lightpipe. 2 x 2 S/PDIF handles other digital connectivity, and word clock synchronizes ProjectMix with other digital devices.

ProjectMix I/O also serves as a 1 x 1 MIDI interface, allowing the user's computer to connect with MIDI hardware. Monitoring options include two ¼" headphone outputs with separate volume controls for working with a partner, as well as two stereo output pairs for routing to monitors, processors and mixdown devices. There's even an A/B headphone source monitoring switch for cueing. ProjectMix I/O brings all of this to the user's computer with a single, simple FireWire connection.

ProjectMix I/O's eight channel strips can map to as many channels as your project by simply pressing the bank +/- and channel +/- controls. Each channel strip features buttons for mic/line, record enable, mute, solo, and select. In addition to a touch-sensitive motorized fader, each strip has an endless rotary encoder knob whose function is assigned by one of 15 dedicated buttons for EQ, aux send and more. Related information is displayed in the LCD window directly above each encoder. The encoders and LCD double to control assigned plug-in parameters as well.