mic in htc usb converter

[alex jb]

I just used the HTC converter thingy to be able to plug in my 3.5mm jack into the car.
It's the one I got with my diamond, I didn't get one with my TP as it was an e-bay purchase.

I tried to make a call and the other end could not hear me, no mic action.
I thought there was a mic in the converter block?

If there isn't, why did this set up work fine with my diamond, but not the TP?

Is there a seting I can change to keep the phone mic switched on when the converter is plugged in and it takes over audio out duties?