The Korg EXB-FW is a 2-In/6-Out digital audio and MIDI FireWire Board for the Korg M3 series of synthesizers.
The EXB-FW provides 2 audio inputs and 6 outputs, plus 16 channels of MIDI communication to a computer using a single cable. Not only can you route audio in and out, but the M3 is seen as an audio I/O for your computer, so you process audio into the M3 w/effects and then into your computer, run track/audio out from the computer through out effects, or the sample into the M3 and much more.