Thank you Boki for explanations.
Internal engine (english) did solved the problem, but when there is no croatian language, I can't use that engine.
I found a solution for my problem.
Because I used VocalizerEx2 engine, Head Unit system did not show/offer that application in the list as default GPS app, same thing with Google-engine.
So I did try Alfanum engine, and then I could put that engine as default GPS app. And then system recognized that TTS sound, and then I can have Radio app in background with navigation.
Only bad thing with that is, button on HU will not lunch navigation app, or if you have straight wheel control same thing.
Radio app in background with navigation, no sound = solution = put TTS engine as GPS app.
VocalizerEx2 is old, but I really like that sound for my language (language downloaded from freedomscientific site)
Alfanum sounds to me like a machine.
I just tested with Code Factory Vocalizer, much better and close what I have with VocalizerEx2. Sounds like is't not 100% smoothly. I will play with settings.
But it’s all a matter of personal taste what engine you like
@Suleyman
If you have not solve your problem, try put Google engine as GPS app, if you can't do that, use some other engine and set it as GPS app in Head Unit.
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