Sounds like you are in "simu" mode for 5 channel surround. Try changing to "stereo" or "direct" for two channel listening, or hit "std" and certain parts of the music will be sent to the center or surrounds.
That is how the modes are abbreviated on the remote for my 3808 so I assume yours is similar. I find the 5 channel "simu" mode to be the worst way to listen to music. Usually go with stereo or direct as the vocals sound much better out of my m80s than on my vp150 which is where they end up in the "std" mode.
