Dolby Pro-Logic 2 music setting can be very affective in creating a 5.1 surround sound effect. Most think that there is some magical audio mumbo-jumbo going on. Far from it. Once you are dealing with a 2.0 stereo track, the potential for multi-channel sound exists if a circuit can recover spatial ques that are imbedded in that stereo track whether deliberately put there or not. That is what Dynaquad did and that is what DPL-2 music does. Your source material must be 2 channel which encompasses all 2.0 stereo recordings meaning tape, VINYL, etc... Intentional multi-channel sound would be found on quadraphonic recordings. In one case, on the stereo vinyl album, FIDDLER ON THE ROOF(the play), the stage was right in front of my eyes sounding quite weird and better left listening in stereo. I had a vinyl direct to disc from Radio Shack years back that had stereo but absolutely no surround information to be reproduced. In another case of vinyl, the first LP that I ever bought in 1962 (IMPACT by Woody Herman) had the most stunning unintentional multichannel sound one could possibly hear, such that I think whoever mixed this disc must have been aware of what he or she was doing. If you are using DPL-2 music, try the circuit on your 2 channel recordings and judge for yourself. If you use DPL-2 music, be sure to tweak the dimension and width and leave panorama off. If you shoot stereo sound with a camcorder, try the DPL-2 music mode on that as well. You may be surprised what you hear.