Most MP3s I see are stereo and even on a 5.1 device and speakers you get "stereo."
Your post is light on the detail about the sound source file. If it is not 5.1 why would you expect 5.1? Do tell.
I have a USB to SPDIF converter that is supposed to support 5.1 surround.
I can hear stereo sound, but not 5.1 surround.
I know there are many free tools that enable passthrough on spdif so the receiver does the dedcoding instead of the PC.
However windows XP doesn't see the USB audio device as SPDIF
is there a way to configure the USB audio device as SPDIF without drivers?