I have a DTS compatible receiver that accepts Optical Digital Audio Input. I am considering getting a DSS receiver that has Optical Digital Output. I know that only some channels actually broadcast in Dolby (HBO, Showtime, some preview channels, and some pay per view). My question is, if I have my receiver on Auto Decode what format am I going to be getting for most regular channels? 2 Ch Stereo? Pro Logic Surround? I don't like watching TV in 2 Ch stereo, so it will be a pain to switch my receiver from Auto Decode to a Surround Sound Field and vice versa.