Alright here's the deal-- I have a y-cable running from the headphone jack on my iMac, to my audio receiver. Half of the time, I like having the sound from my computer running to my audio system so I can listen to my music real loud. But, the other half of the time I don't want the sound running through my system and rocking my room. Right now, I just pop the audio cable in and out of the headphone jack when I want to change where the sound goes, but is there a way I can leave the cable plugged in at all times and just switch the output source from my comp? I've been searching and so far it doesn't seem like I can. If you can help i'll be really really psyched.