BTAudioOff and the rest of the group of BTAudio files simply redirects all of the sound that would go to the speakers to your BlueTooth headphone, and it doesn't give you the flexibility that A2DP has... but... the TMobile MDA and the 8125 don't have enough processing power to easily work stereo music & bluetooth conversion & the phone simultaneously, so the music sometimes skips...
I'm still waiting for a better solution, since I don't like using wired headphones....
Manuel