I've got a three way audio switch. The sound comes from the 1/8 stereo phone jack on the back of the computer, goes into the switch via left and right RCA jacks, and either goes to the in-cab amplified speakers, the headphone jack, or the third set of RCA jacks that'll eventually go to the big component sound system when I have my game room set up. Right now setting C acts as a mute button.