I have an AppleTV, a Samsung series 6 plasma, and a Bose 3-2-1 GS receiver/DVD player/speaker set-up. The problem I have is the following: I have encoded about 300 movies with the required AAC track and then the AC-3 track, and occasionally another AC-3 director commentary track or other such audio, always in AC-3 format. The AppleTV recognizes these multiple audio tracks, but refuses to play the AC-3 track, instead, playing the AAC track. The connection of devices is as follows - AppleTV -> Samsung Plasma via HDMI -> audio to BOSE via optical out from plasma. Is it possible that in the HDMI handshake, the plasma is calling for stereo sound only, since that is what it's speakers are set-up for (even though I'm not using them) and that is all the AppleTV will provide (thus the AAC track)? I don't have a receiver with HDMI inputs, so I'm unable to hook this up differently to test it with a true 5.1 source. Thanks in advance.