I am using the arc 2 to control four tracks when I play live. Each track is assigned to two rows of the grid. When I touch either of those grid rows to affect the track in some way, the arc shows master volume and one other parameter for that track.
Modes like this are usually not my favorite design choice. But in this case it’s a very simple set of choices. And if there is only one mode, why have control decoupled from feedback anyway? Until I have an arc 8 I’m happy with this setup.
My app is some C++ code that keeps changing every performance. If I come up with something more generally useful I’ll share it.