I'm wondering why I can receive the audio on the PBS HD channel on AMC3? I tried the outdoor HD channel and there is no audio. I found a couple of feeds last night with no audio and was subsequently told they were AC3. Unless they were mistaken and it was Dolby E I don't see how I can receive the PBS one. The Dolby logo lights up in the onscreen graphic on PBS just as it does on outdoor (G10R). Is it also outputting MPEG audio?