yeah, its super necessary to have an undo function..
Maybe Korg designers are very aware of this limitation and they are waiting for everyone to complain in order to launch the next kaossilator 3, which do have undo, and which they have already done, but the want to make it seems as if they "improved" the thing.. but they only want our money jajaj :-p
(maybe joke, but im pretty sure the corporations do that)
anyway,,, will be super cool to find a hack to make this undo.redo button
and I agree.. sometimes technical limitations make you push further your creativity.. im still happy with this thing
