I tried prodgers74's trick
with my Sprint Mogul (HTC Titan PPC6800) running on wm6.1 radio version 3.42.02: I made a Skype call and waited to be connected and then clicked on the file for troca2 and turned it on. Then, not only did the sound come through the earpiece but also the microphone started to work as good as in making a regular call. I had posted in the AudioSwitch thread
that only the sound came through the earpiece and the microphone was not working when using or AudioSwitch or troca2. In those cases, however, I had turned on troca2 before making a call. Now if we could only program the AudioSwitch program to do this trick automatically! Hope this trick works on other PDAs as well, so just try it and post your results.