Hey KP Just a note. I have a DTP, a dual 1.25 G4, OSX, and PT6. There is NO Serial port adaptor on my system There is NO Serial to Midi box on my system ALL I have is a tiny USB / Midiman box. The DTP connects via Midi to the Midiman, which is connected via USB to the computer. Pro-Tools see the DTP(as well as my HUI) and syncs just fine. No problems!!! So before you gut your Mac, removing parts you may need later, try out my solution first. It works. Period. Good Luck!