With MDk 10.0 Offical there was no problem with the Onboard Soundddevice:
NForce 2 & ALC 650/655
NForce 3 250 & ALC 650/655
With the 10.1 RC1 you have a problem !
Sounddevice will be found but only silents on the speakers.
Anyone have the same problem or an resolution for it ?