2 things - I assume your playing a multi track file so try using XBMC and be sure to setup the audio section for 7.1 and your analog device....
I use an ASUS HDAV 1.3 Deluxe with JRiver MC and play alot of music and movies in surround with no problemo.
I use an ASUS HDAV 1.3 Deluxe with JRiver MC and play alot of music and movies in surround with no problemo.