whell I dont think that they will use the voice regination system while sitting in the car at 170db+, so the just have to disconet the mic, as your voice proberly wont be loud enuf for the system to work.

have you ever tryed to play a 50Hz sound at peak level !!!

Mark
wait for mk III with a USB Host/slave
(USB->Ethernet)(USB->COM 1-8)(USB->You name it)