igo 6\8 and games; problem with audio gateway-bluetooth

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hi all,
i have very annoying problem with my asus 636n (wm6), I bought bluetooth headset and i can hear any mp3 or any system sound good and in stereo but i cant hear any games or igo 6\8 sounds.. i tried every think i can think about..
1. play with the bluetooth headset and config it as mono head set (like cell phone).
2. all the regedit options of igo sound.. and play with all the commands in "sys" file.
3. open and change all the options in audio gateway regedit.
4. i tried to install new bluetooth drivers but i got no success even when i closed all the bluetooth processes.
and play around with all the stuff i can think about.. i even tried to ask the nav & go ppl.. and they dont know what to do...

i search here and i got nothing that work..
please try to help me if know any idea what i can try

by the way sorry about my English i am using online translator.