I agree this issue is not for this thread, but I do not see nothing wrong trying to help and share experience about similar issue.
When you are familiar with what has been mentioned, is there solution why just radio app of head unit is blocking TTS engine?
Usually what I found is sound of navigation is too low, or doesn't work at all. But I didn't see someone mentioned where only radio app have problem with TTS engine.
So, if you know anything about that, I would really like to know how to fix this.
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