It depend what anyone like to see and listen...
Simply you can modify sys.txt to listen what you like...
The truth is, navi should start talking if you see speedcam front of you....otherwise why you have navi ON?
Nevertheless, if you don't like TTS or voice to stop audio (Radio or CD) you must set inside sys the following:
[sound]
pause_mp3_sooner=0
Strange (you say) is screen change....
I don't have car audio system and I am not familiar with this, sorry!
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