I posted this question in the thread for the Yamaha DSP AX763 but didn't get a full answer so thought I'd ask the generality. If any one could help I'd be very grateful. My question is regarding the surround decoder option for Neo 6 and Prologic/II. Recently I sat down to watch a film encoded in 2.0 (2.1?) Dolby Digital, decoded by the PS3 and hooked up to a 5.1 system. I hoped/wondered if I could use the surround decoder to interpret the stereo signal into all the channels. Am I misinterpreting what Neo 6 and Prologic do? Weirdly when I enabled Neo 6 Cinema, Prologic or PrologicII Movie I only got sound through the center channel yet Neo 6 Music and PrologicII Music gave me stereo. I don't really want the 7ch Enhancer as that's effectively stereo in each channel! I tried bitstreaming the signal to the receiver but that didn't make a difference and unfortunately I can't find any DD stereo-only dvds to test. I seem to have got the impression that people were using Neo 6 and Prologic with freeview and Sky audio for their surround systems. Is Neo 6 and Prologic another type of specific encoding?