Thanks a lot for your detailed explanation. Yes, I believe I understand how it’s built, but then I think I also understand that I would need to know all this vocabulary and syntax to build my own which I don’t. So I guess I will have to copy your code and adapt to future needs.
By the way, taking this opportunity to know if you have any idea how Martin built this :
It’s a variant of what we just discussed. The same thing except that it displays different faders depending on the first fader’s position. Like different menus. Typically useful for different FX for example…