Greetings!
I have the M-Audio Profire 2626 which is missing the breakout(WC, S/PDIF/MIDI) cable. These are so scarce as to be unobtainable. I'm reasonably sure that all M-Audio Firewire devices use this same cable.
I located the DB-15 pinout and have the S/PDIF sorted, but MIDI is frustrating...