I also have it set up for a 5.1 surround.
Now... my problem: I have to apparently use ALchemy to get X-Fi CMSS 3D to work properly, and thus make all mono sounds play through the full front speaker array (left, center, right) instead of just the center. However, it has developed a bit of a nasty problem: if a rapid fire weapon or explosion goes off... there's a chance that my whole computer will BSOD on me.
If I disable ALchemy for FONV, it works without a hitch, but then all the mono sounds only play through the center speaker; stuff like weapon animation sounds (bolt action, reloading, equip/unequip), footsteps, and two-way dialog with NPCs.
So does anyone know a way to make the mono sounds play through the entire front speaker array?
I have FFDShow set to not run with FONV, and have also uninstalled AC3Filter.