For more information: Brought to you by: USB bus-powered 4 x 4 24-bit48kHz audio interface with dual mic instrument preamps balancedunbalanced analog, SPDIF and MIDI IO SPDIF digital; MIDI IO ¼" headphone output with level control and AB source switch Mac and PC compatible; class compliant with Mac OS X 10.3.9 and higher The M-Audio Fast Track Pro delivers all the mobile recording flexibility of the Fast Track USB, plus even more professional features. You get 2 front-panel micline inputs complete with phantom power for condenser microphones, inserts for outboard effects balanced and unbalanced analog outputs, SPDIF digital IO, MIDI IO, and more.