I had some trouble with the very cool toy called Kaoss Pad Mini. It's quite complicated to hit the exact point when dealing with loops. Unfortunately there is no LED matrix like on the Kaoss Pad 3.
So I made my own alignment. It looks like this:

I have figured out these lines by "Try and error". I took two display protection sheets. These things you put on your smartphone. I cut them according to THIS pdf.

Then I fixed the first one on the pad. Then I took a white pen and painted the lines. Then I placed the second protection sheet on the first one. Thats it. Holds for 5 years now.