Right now, we have "grey for visual channels (not hidden)… we have “orange” for hidden channels.
I would like to propose a 3rd state - SHOW ONLY HIDDEN (maybe green?).
There are many times I would like to instantly access only a certain group of channels and I am searching through them to find the ones I want. Imagine this - normally, you click on “Hide MIDI channels” to hide them. What if Alt+click on the same button causes it to turn green instead of orange, and you see “only MIDI channels”?