I have the M-Audio Audiophile USB sound device and i am using Vegas and Acid with it. my problem is that i cant hear my turntables unless im playing back a recorded sound. so if i want to just listen to a record before i record it, i have to listen to it through my dj mixer which has the turntables connected to it. i cant listen to it through the sound card. i have the outputs of the sound card which are RCAs connected to my stereo...it plays back a recorded sound just fine and it plays back the system sounds as well, but i just cant hear my turntables (which are connected to the line in) unless i record from them, then play it back.