I am aware that there are a number of threads on this topic here and elsewhere, yet I have spent hours searching, reading, and attempting fixes to no avail.
I have a computer with a NVIDIA GeForce GT240 graphics card that is passing audio and video via HDMI through a Denon AVR-591 receiver, and on to a 5.1 speaker set up. As many other people have experienced, I get left and right stereo audio but not surround sound. My graphics drivers are fully updated, and set to 5.1 audio in the controls for sound. In fact, in that configure window, I can click each of my five speakers and my sub individually to test, and they all work! As soon as I try to play anything through any media player, however, I go back to stereo sound.
My understanding is that if the source (my music and junk) is stereo audio, that is all it will play. Is there any third party app that will mix the audio to surround? Is there some other clever way I can set this stuff up? Any other bright ideas? Thanks much for any help in advance.