Sony MBR-100 and Windows 7

[DigiTalk]

Hello!

I have connected the Sony MBR-100 to my stereo.
It works pretty well, even if the range isn't very long.

But I have one problem:
The volume is pretty low. The manual said, that the volume of the MBR-100 can be controlled via Bluetooth. But I don't know how. Windows just lets me control windows-volume, but I didn't find a way to control the devices volume.

I'm using the Bluetooth Stack which I got from Broadcom with Windows 7. I'm not sure if it's Widdcomm as the device manager still lists a "Microsoft Bluetooth list". But without the stack, Windows doesn't support A2DP...
Any Ideas?

Thank you very much!

[Lennie]

But do control buttons of the headset not work?