I have this recurring problem with sound locking up the WS when playing MP3 or longer WAVs. I tries a few of the suggestions here, but the problem remains after 3 days of fighting.
Promise Ultra 66 PCI controller
ISA 10 network
128 MB RAM
2.1 GB HDD running in DMA 2 mode off the Promise
disabled on board IDE, serial, Parallel, USB
Tried to reserver IRQ 15, 14 so that maybe no IRQ conflicts will be hidden. No luck. All I can think of is maybe slow down somehow the Promise controller ? Seems like it locks up only when there is sound and disk activity at once (like cleaning the trash bin and DING ! locks up, but DING ! sound only is fine or disk activity is fine if no sound is playing). Changed sound IRQ from 10 to 5, disabled DMA, updated drivers, no luck.
Thinking to reinstall win98SE, but thought to check here first.