hi,
In my case the sound system crashes when a game with surround uses the headphones and another program uses the speakers.
All I hear then is distortion, until I restart the computer.

I can confirm that for some reason songs and audio tracks play with different speed and pitch, when changing the sample rates of the sound card.
This also happens with Video audio tracks, depending on the software used. MPCHC for example doesn't have this problem, my guess is that it doesn't rely on the soundcards timer.
But the audio and video tracks of several games are not synchron, which can become very annoying.

What setting did you use to get the "speed" of the song right?