In call volume too loud...

[cripita]

Unlike other people in this tread I find my in call volume to loud even with the volume all the way down (I'd believe that doing this will let me without audio, but no) with any ear piece (stereo headphones, blue-tooth).
I usually listen to music or have the navigation on when driving and overoll I can manage the volume for this applications in a confortable way but never with the in call volume.
Is there any recommendation, cab or anything else that I can use to lower this volume in my Touch pro 2?

Thanks in advance!