I think the most people only use 2ch. I'm not sure if the driver even supports 5.1, but I have no possibility to test it. Some people had problems that sound came from the Mic output and so on in the former days of OSx86 ;-) Have you tried to reinstall the driver with the commands i gave you?

Yes, I've tried that one more time - but I don't know if/where is a more up to date version of the kext. The only solution I have right now (apart from using only two of my 6 speakers) is to connect the front panel audio output line to the extra line in jack of my speakers volume controller - this way I can have the stereo sound split between all speakers and subwoofer. But note that it's still far away from the real 5.1 surround! I appreciate your kind help, though, really. My next question would be - what kind of sound card would be recognized by leopard driver's as a 6 channel enabled card? I mean, isn't anybody using zephyroth's, kalyway's or leo4all simply to watch a movie with surround? :)

Sorry, I never heard anything about 5.1 on OSx86 - try searching at insanelymac.com. I''m using an M-Audio USB interface which has a special prefernces pane for the Mac.
But this is a professional low-latency interface with 4ch input and 4ch output channels, so it has nothing to do with 5.1.

I guess I'll stick with 2ch for now, then. Thank you again for the suggestions. I'll post some sort of solution if/when I find one, for the world to know!