Why do you quote me if your remark/question is on a completely different non-related topic?GPS Mix it’s not glonass and gps. With that on when you listen music for example and using navigation at the same time the navigation voice will overlap the music but will not mute the music, with that off music will mute when you hear navigation voice.
And please explain what you mean and be specific in what you use.
Which nav app do you use? Which music player do you use? Which brand FYT unit? which firmware? You tell us nothing.
I use both Magic Erath and Google Maps and occasionally OsmAnd as navigation app and all with both glonass/GPS. I use DAB-x, normal radio and media players and all get muted /reduced when the navigation app issues the instructions.