[david950]

I do use the option for yellow flag / track call with my Arc PRO (press both brake and lane change), so I know it works with PRO. I have an old AIR, I can try setting up there to see if I 'lose' the option.

Maybe that's the key, that Magic knows whether it's connected to AIR or PRO and if connected to AIR, knowing there aren't 'real' lane change buttons, the option is suppressed in the app?

Assuming you're using a tablet, I seem to recall you can make a track call by tapping anywhere on the screen? Not quite as easy as the controller option, but it's what we used until we found out otherwise.

One more thing about the controller option - I'm pretty sure only the person/controller that made the track call (yellow) can release it (green).