On AmigaOS this no-sound-problem could be solved by installing AHI V4 instead of V5 because Adescent (and Abuse, too, if I remember right) uses a feature of AHI V4 wich is not longer present in V5.

I did not try this with MorphOS yet, but if you want to try it you probably have to rename ahi.library in mossys:libs directory and copy ahi.library V4 to libs: or to mossys:libs.

Maybe this helps.