Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
on_slider = function(slider, x,y) if x < slider.x0-slider.w/2 or x > slider.x1+slider.w/2 then return end if y < slider.y0-slider.h/2 or y > slider.y0+slider.h/2 then return end return true end