Adjusting volume on BT headset during call?

[peta§]

I can't adjust the hearing volume on my bluetooth headset via the volume control on my Polaris.
Is this a bug or a HTC feature? In that case, a really dissapointing one.
The volume control on my 4 year old Motorola Razr did that job.

Anything to do? The problem is that my BT doesn't have any volume controls on it, it relyes on the handsets control (Sony Ericsson HBH-IV835)

[peta§]

Anybody knows?
It's bad, becuse I love that handsfree. But not beeing able to adjust the volume isn't good, I then have to change handsfree.

Btw, is there a registry setting for the BT handsfree volume?