I just started using an 002 Rack myself, with a Digital Audio 733 G4, 1.5 G RAM. Demo song played very smoothly, no hesitation, etc. I'd check two things... First, is the 100G your *only* HD? From what I've read, using one HD for both your system and audio files isn't recommended, and would cause problems. Very easy to add a second drive, and not at all expensive - - extra 120G drives at $100 (Western Digital Caviar standard editioin, etc.). Your G4 came with the screws to install the drive onto the carriage that holds your single drive. Second, the 733 chip in the QuickSilver, if memory serves, had little or no L3 cache (I could very well be wrong on this...Apple's site has in-depth info on such things...). If adding a second HD doesn't help, you might look into OWC's new 1.33Ghz upgrade for your G4. Very positive reviews, and the G4 on the upgrade has 2Meg L3 cache. I'd do the drive upgrade first...never enough room anyway! Best, Len