Yes, for me the sound is OK too.
But if that can help you, when i'm in my car with my phone connected in bluetooth for call phone, i have'nt the sound in my app GO.
I change parameter in my car (i put OFF the bluetooth option for music in my car with phone source) and now the sound is OK to my phone speeker. And the call go into my car like before. just the music source is closed.
I hope you have understand !! LOL