USB virtual Surround and FMOD

[diaster]

I have been experiencing sound issues. A good example is, a tank my right fires it’s gun, and it sounds like left. A tank behind me fires and sounds like to the front, I swivel to the front as machine gun fire, I can’t tell if it’s a tank or an airplane.
 I am using the chalenge custom sounds
I have a roccat elo usb headset and as I understand it one drive for each ear unlike my old turtle beach that had six driver but was analog and needed a sound card.

The question. If I have 7.1 selected in game, should I set the headset to 7.1 as well (currently) or does fmod donthat work and I should just leave the headset in stereo mode.
In other words does fmod send real 7.1 or virtual (sends out of phase signals to just two drivers to simulated 7.1 or does it send 6 channels plus sub?

Or…. Is there a fix for this sound issue. I hear driving around from the correct direction and plane sounds as well but gun fire. It is never from where the gun is!

[Chalenge]

I have windows using stereo headset and the same for AH3.

[SPKmes]

Not sure if it just me...but I find that there seems to be confusion when you turn the turret from the hull natural aspiration ...this is when my directional sounds get messed up... turret lined up with front of hull sound direction good... turn the turret...and confused sound direction...almost like it can't work out which front it should be using so it uses both...probably something to do with the fact it is digitally making 7.1 sound...so I have reverted to plain old stereo in a GV...
oh and i use the generic AH sounds

[Ack-Ack]

If you want to use 7.1 in games, make sure sound is set to n 7.1 in Windows.