New to Directv, and I have a question on the receiver's audio settings. It appears that if I enable Dolby in the audio portion of the setup menu, that I have to leave my a/v receiver in "auto", to pass through the decoding. Or, I can turn-off Dolby, let the Directv receiver pass through pcm, and then force the a/v receiver to decode using Dolby IIx. Forgive me if some of my terminology is incorrect, but any thoughts on Dolby on or off?