I've had the Panasonic SA-XR55K receiver for a while and have this question. How do I switch from TV audio to the optical from my mac computer? I have the TV hooked up by component, and the computer hooked up by a very long optical cable to "optical 1". The only way I can get TV audio to the speakers is by popping out the optical cable. If the optical cable is plugged in I can't get audio from the TV. There must be a way to switch between the two but I can't figure it out. I tried getting an optical splitter and having optical from both the TV and the computer but that didn't work. I guess optical splitters don't work the way I thought. Any ideas? Thanks