Thanks Dazz, and good luck pinballwizard on trying this out. scof, good suggestion.
PinballWizard, make sure that you don't have multiple audio drivers installed, and if you do check that hyperspin is setup to output the the one with the speakers. ARe you hearing audio output in hyperspin? if not, this is still likely your issue.
DirectSound is a DirectX technology within Windows that media applications/games use to talk to audio hardware.
Consider it a layer above the driver that makes all drivers and hardware look the same to a Windows application.
this way a windows developer can write software that makes sound, without really worrying about the intracies of the specific audio hardware/driver details.
Dazz, it may be worthwhile to get the word out that weirdness in hyperspin can be caused by audio not being configured up correctly, even for graphics issues.
Dan