navigation audio

Hey guys, I'm a new M3 owner in Switzerland and I'd love to set my navigation language to English US. The menu only displays "British English" and this is really annoying. I have nothing against our kind English friends, however I really don't like the accent and I'd like to set it to what I use...

Is there any way to set up the Tesla navigation system so that it turns down the radio (or pauses Music playback) when announcing directions? In my model 3, the navigation system just talks right over the audio stream making it difficult to hear the directions. In every other car I've had, the...