I used to use a Performa 600, and had similar problems. <Seemingly> random
sound dropouts would occur, and I was never able to replicate the problem
(some apps did it more than others, but not all the time). Once the
problem happened for a particular computer session, the only way to get
sound back was to reboot.
I suspected that the problem might have been SoundManager 3.0, since before
I installed it I never noticed the problem. I didn't really spend a lot of
time on the bug, so this is just speculation.
Anyway, I've since purchased a PowerMac, so I don't think about the problem
anymore. Thanks for the memories, though.
later,
-Pete