So I'm using a Windows laptop, a pair of HD-280's and an S2 connected with 1/4" cables to a pair of KRK 6's. Everything works like it should in Traktor.

I'd like to run my computer's audio (Winamp, videos, etc) through the KRKs, but I can only get sound from the headphone jack on the S2 when I try. Does anyone happen to know if there's a way for me to use the monitors as computer speakers (so I can listen to a song without loading it up in Traktor) without having to use any adapters?