Is it possible to play both 5.1 AC3 AND stereo 2.1 in DVDAP6? I have a main menu which has 5.1 audio and it works great. However when I hit play to my main media file from that menu it plays no sound at all. I assumed it would automatically switch to 2.1. Do I have to re-render my main file audio to AC3 as well to get i to work?