5.1 speakers

Harkiter

I own 5.1 speakers.
I didn't know this game supported surround sound, cause there are no options on the menu, but apparently it does.
So in native and VC the sound works fine, in NW it doesn't:
-If I set stereo from windows it will use the 2 front speakers only and the sound works fine;
-If I set 5.1 surround the sound works fine except for the fact that I hear my shots behind;
-If I set stereo from the remote it will use all the speakers in stereo mode but I can't hear my shots, this doesn't happen with the pistol in native.