Dolby Pro-Logic 2 Musicis my choice for any two channel to 5.1 channel source that I listen to. The adjustents for DPL-2 Music on your reciever are important to calibrate in your own mind where the sounds should be in your listening room. What you are trying to achieve is a 5.1 image resembling D.D. or DTS 5.1 discrete. IMHO, most important of those adjustments is dimension and width. I do not care for Panorama. DPL-2 Cinema lacks those two adjustments and IMHO sort of makes it worthless. DPL-2 Music appears to sound like a passive 5 channel Dynaquad circuit that i use to deploy and in fact appears to place the musical spacial ques in place much like that circuit. Unlike Dynaquad, the processing now takes place in a computer chip.

The one circuit that I have never had the access to try was Lexicon's Logic 7 which may have been the forerunner of DPL-2 music and cinema.

On the Pioneer vsx-516, DTS Neo works better than two other recievers that I had that had the feature but it is not impressive in its results. To be fair, I have only used it in 5 channel mode on my system. I have heard it on another system in 6 channel mode and was not impressed at all with it. To tell you the truth, I have not been impressed with anything the DTS company does in the realm of DTS movie audio and the DTS Neo codec.
But that is a subject for another day, "perhaps"