Reply to Some questions

I'm making a clone of the Midifighter for my project. I see in the movies that in 4 bank mode you can press the active bank button to keep the effects going.
All the leds keep burning, is that something the firmware does or is this a mapping feature ?

Except for the supercombo buttons, are there more special features you need to implement in a clone ?

What I will do is the leds and the 4 bank mode with all the notes I found on the community .