Reply to mapping loops in duo

I have been having an issue with mapping looping controls to buttons (on a nanokontrol).

I would like to have it set up so the is a loop -, a loop +, and a loop activate/deactivate button. I have the + and - down, but thats as far as I can get.

I can't figure out how to get the activate/deactivate button to work. I've tried a few things and cant get it down.

Anyone wanna give me some help?