i have pentium 4, windows 2000 xp pro, using onboard sound card Realtek AC 97. i am using a software called Virtual Dj. i can use either the headphones or the speakers, but not both of them simultaniously. what should i do in order to be able to use both at the same time? the line out that goes to the speakers goes first to a stereo Marrantz amplifier. if an extra sound card is requiered, can you please recommend one that has a good sound but costs around 30$ (if something like this exists at all...)? THANK YOU.