Update :

Application tested, seems to work OK.
Found 1 bug, when you are streaming music thru FM-transmitter, and a call is recieved, the call is correctly sent to FM transmitter. BUT when the call is ENDED, the FM transmitter is somehow switched OFF, altough is says it is ON. The music streaming is no more sent thru FM-transmitter, instead is it played to the phone speakers.

Manually switch OFF and back ON the FM transmitter solved this problem, but is not very handy.

For your information:
When you don't use FM carkit (off position) and playing music thru fm transmitter, and a call is made the call sound comes thru the phone speaker, when you end the call, the music continious playing thru the fm transmitter,is back swiched on.

Somehow the FM carkit stops the fmtransitter to switch on.

Any idea's??? to fix this???
Thanks anyway for your effort.