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Question: What's the right setting for my Yamaha RX-v365 and Bluray disks?

Cable TV running through my receiver works in 5.1 mode just fine, however my blu-ray player (samsung) seems to need the receiver to be on dsp setting (the one in the manual suggests the DVD Movie Dramatic) mode.
This seems really odd to me.
Am I getting a synthesized 5.1 sound, or is this how the receiver handles DTS and TrueHD and Prologic?