I'm not into the different programs that much, but I do like to listen occasionally to one of the Yamaha' s Jazz club DSPs, 5/6 channel stereo, Pro Ligic II, or direct two-channel. If you have speakers that image real well, it's amazing how many people think the center is still on during direct two-channel listening. They have to put their ear to the speaker to be convinced. IMO Yamaha is king when it comes to DSP programs, with a possible exception of Lexicon. Both have many programs to choose from and customizing controls to suit your tastes and environment.