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Join Date: Nov 2006
Location: Colorado Springs, CO
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I don't own that AVR, but in general...
All digital sources require a specific decoder to convert the bits into something usable. The two most common digitial decodes are Dolby Digital and DTS.
Older matrixed sources such as Dolby Pro Logic soundtracks require a matrix decoder such as DPLIIx to extract the various channels.
AVRs usually allow processing beyond the initial decoding or dematrixing. For example, 5.1 digital soundtracks can be expanded using something like the DPLIIx decoder.
My point is that some of those options you mentioned aren't mutally exclusive.
Mostly you can just select the automatic modes. If you have a 7.1 speaker setup, you may want to choose the mode(s) which can convert a 5.1 soundtrack to 7.1. Some soundtracks are already 7.1, and you may need to properly set the mode to hear those as intended. Which is where DTS ES or Dolby Digital EX decoders come into play.
For more information see Dolby's or DTS's webpage.
"But this one goes up to 11"