I have a new Klipsch Reference 7.1 set-up driven by the Yamaha RX-V2700 and Toshiba X-A2. On HD-DVD's, but not standard DVD's, the panel of the receiver indicates that the audio is "MPCM," regardless of the processing used in the source. For example, when watching Batman Begins, it says MPCM even though the movie is processed in Dolby Digital. On T-2 (Studio Canal import), it says MPCM even though it should be in DTS. On standard DVD's, the receiver displays whatever processing the movie uses, be it DD or DTS. What am I missing here? Any help at all would be appreciated.