I have that same problem on my 2 din unit. It's like the radio app ignore all others sounds. But when I play some music or video with some other app it's all good, I can hear navigation using tts and music in background.
So can you please tell me where is that option for "removing the check from the radio app to override the other apps"?
After you uncheck override the other apps, you can hear navigation (tts) and radio at the same time?
This was driving me crazy, why navigation can't work with radio app.
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