I have a TT710 with Navcore 7.9* and I was wondering if there is a patch that would enable the sound to be able to come through headphones when on a telephone call connected via bluetooth. Main reason is that the sound from the internal speaker isn't particularly inspiring.
Also, can I plug an external microphone into the microphone socket? So effectively having an input to my car stereo for the speakers (from the headphone socket) and a headlining mounted microphone for my voice (into the microphone socket)

Both these sockets are located on the screen mount.

Thanks in advance.