Lowering Volume on Touch Pro2?

[AVakil]

Unlike some others here, I would like to LOWER the volume through the earpiece on the Touch Pro2. I have a set of Ultimate Ears Triple Fi 10 with microphone that completely seals all outside noises and when an incoming call comes in, it's far too loud for me to hold a conversation. The volume bar is all the way down the no bars when I am in a call and it is still too loud.

I would like to lower the in call volume, but if that means I have to lower the overall volume of the phone in itself, I'm willing to live with that as well.

I know there are registry hacks to increase call volume, but how about decreasing it?