Cesar, hopefully a Denon owner can help with the key presses for DD, rather than me trying to figure it out, but I'll try your 2). DD+PLIIx means that DPLIIx is applied on top of DD for a 7.1 setup, i.e., the front three DD channels aren't affected but the surround info in the fourth and fifth side channels is processed. The material which should be imaged in back is extracted and sent to the back surround speakers.

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Enjoy the music, not the equipment.