Hazzer :
jwk3 :
You'd have to connect your stereo headphones via 3.5mm audio jacks and not USB for it to utilise the soundcard. The soundcard will come with the Xonar DG Audio Center software which will do virtual surround sound. I've got this soundcard myself and have tried the virtual surround on normal (stereo) headphones.
How does it sound and is the virtual surround sound any good?
I've never tried it properly myself as I've never had the need. For music it's not very good as it makes the music sound more distant and faded, but if you're playing a game you may like it due to hearing where the action is happening a bit easier. this would however require the game or audio source to output 7.1 channel sound, otherwise it's literally making up the location of the speakers.