So I have a fresh Pioneer 1015 that I have in a 7.1 speaker setup. I've poured through all the threads on DD-EX, DTS-ES and DPLIIx, but I still have one question. When I play a movie with DTS-ES Descrete mode on the Pioneer what happens to my 6th channel if DPLIIX is chosen? Here are the four relevent choices choices the Pioneer gives me. 1) If I hit Auto-Detect the Pioneer correctly Displays EX-Discrete. 2) If I then hit the THX button It still says ES-Discrete but the THX light comes on. So I'm assuming it's the same as pure ES-Discrete mode, with the addition of the THX processing 3)Now it gets confusing to me. If I hit the advanced surround mode button I get DTS + PLIIX Movie on the display. Now the Dolby site makes the point of how DLPIIX makes 6 or 7 channels out of 5, but what happens if there is an existing 6th channel already? 4) My Final Choice is DTS+PLIIX+THX I'm assuming this would be example 3 with THX post processing added. So I guess the primary question is what will DPLIIX do to my 6th channel?