I keep clearly say Dolby Pro logic not dolby pro logic II or IIX. It was invented to try and to accurately produce the original Dolby Surround. Later version ii and IIX obviously added ability to go to 5.1 and 7.1 and since the information is not in the original Surround mix it is clearly faking the additional info. They also started emphesising that they could take stereo signals and introduce Surround like sound. Now of course they are pushing Dolby TRUEHD, even though there are almost no receiver that can handle it, most counting on the source player (hd-dvd or bllu-ray(optional) to handle). As far as the ViP 622, it can deliver the optical coded Digital dolby to your receiver which means it can deliver 5.1 and appears to be able to also deliver the Dolby Digital EX.