The OS 9 Metro 5 program that runs fine on my G3 IMac refuses to play anything when the program is installed on my G4 PowerMac which boots in OS X but has OS 9 and Classic mode enabled. Other features seem okay and other OS 9 programs run fine. This is not just a case of no sound being produced; the little bar that tracks the notes being played doesn't move (although it seems to vibrate a bit) and the digital display stays at 00.00.00. Has anybody else encountered this problem, and what can be done about it? Thanks.