USB recording interface is 24 bit/ 96k 4in/4out, 2x2 analog I/O full duplex recording & playback. It features 1 mic in, 1 Hi-Z for guitar. The 2 analog outs are TRS. Master volume on front panel with 1 headphone out. S/PDIF I/O is RCA. 1x1 16 channel MIDI / I/O. It has full duplex record, playback. A rugged aluminum chassis...Mac OS X, Windows XP, Vista and Windows 7.