I am using a PCMCIA firewire 400 card to run my MAxtor external HD, so that it doesn't compete with the Firewire bus on my Powerbook g4. I have the PMix I/O plugged directly into the FW400 port on the computer. If you want to run an external firewire drive (on a PowerBook), I think the PCMCIA card is the way to go...I dont get any drop outs... andthat wasn't what my original post was about. Can ANYONE here recreate this: set control panel to external spdif sync, launch pro tools, work, save, close pro tools...and then immediately relaunch and have your PMix be recognized by pro tools, still slaving to external digital sync? I can't. M-Audio tech suppt. told me to reinstall the driver and repair permissions, GRRRRRR!!!!!!! I did that, it ISNT THE PROBLEM. It has something to do with those nebulous cracks and pops that happen when Pro Tools is closing, I am sure of it. -Matt