It was very hard to come up with a title for this thread. But here is the problem: I have 5.1 speakers i used for my PC, Logi z680s. I plugged in an optical cable to them and the PM. The volume control doesnt seem to be synced at all to what is going on. So I can have the main volume all the way down and as long as there is volume in itunes up(not set to mute equivalent) and up on the speakers, there is sound coming out. If I use the speaker out cable(which only allows 2.1), the sound is "synced" so even if I have sound on the itunes up and the speakers, if I lower the volume all the way with the main controls, the sound will go off. How can I force the optical out to play nice and sync with my volume control? I think its worth noting I went into sound options, selected the optical out(when it was plugged in), and muted internal speaker but that didn't solve anything. I also know if I have the speaker volume set low enough to begin with, I can turn the volume down enough in OS X to make it seem mute. But needless to say that requires me manually messing with the speakers anytime I want anything over a whisper, so I can't really call that a solution. Any help would be appreciated.