i did something similar the other week for a job i had ... we were doing a presentation and we needed the soundtrack off jurasic park. The way we did it was just by going from the stereo outs of my video (the wedge has them so just go straight out the tv)and i basically fed it through a channel of my mixer via a cord to change from stereo plugs to jacks. If u dont have a mixer then (i havent used sound blaster)im sure soundblaster has a line in , just use that .. u may have to record in mono, mmm????im not too sure about that , but that should work i think.... good luck...
spider