2 input (combo XLR/TRS), 6 output (2 TRS, 4 unbalanced RCA), 2 mic pres, S/PDIF i/o, MIDI i//o, headphone out, GT Player Express software for guitar, Ableton Live Lite software. I/O limited to 2-in OR 2-out @ 24/96; 2-in and 4-out @ 24/48; 4x4 @ 16/48.