360 & Headphones

[Lateralus68]

I have my 360 hooked up to my pc monitor and the audio leads into the line in socket of my soundcard. When I use my usb headphones I can listen to pc stuff but not anything from the 360. Is there any way i can play 360 games with the sound coming through the headphones?
Unfortunately my wife works night shift and at the moment I can't play the 360 during the day with any sound. Solution??

 

[fish99]

Do the headphones have a built in soundcard? If so is there any way to use them without it, i.e. connecting them through a regular 3.5 mm jack to your internal soundcard output?