If you want to make an audio angle active for that whole duration, select the first clip. In the inspector make that audio channel active. For that clip, "Expand Audio Component" then trim it to last that entire duration.
no no not for the whole just to switch the whole audio. So in case user selects in MC the wrong audio setting (as this is a bit wired UI at least from my point of view) it should be possible to mark selections in the TL and the change Audio for these ones. As I tried to illustrate in above screenshot as "iPhone Tobias and Hero5" are greyed out.
@Tom. Ahhhh yes in the Info inspector you can mark multiple and change it there but not via my thought "right click" method... only Apple know why the easier way isn't possible
Finally I guess in case user wants to select a main audio it should look like below screenshot. So second cam (Hero5) should have a blue clip icon on top right corner and the main audio/video the green one that changes to a yellow icon while clicking on that. Hope its clear what I trie to explain
Ahhhh I see in the "Info Inspector" you can make these changes selecting the MC clip. Good to normally as on my 21 screen I normally close that window