It's cool to be able to visualize these operations. Perhaps you can add a blurb of instructions at the top of the app or in a dialog. It took a bit of playing

It's cool to be able to visualize these operations. Perhaps you can add a blurb of instructions at the top of the app or in a dialog. It took a bit of playing around with to figure out how to make it work. Just a couple of notes about adding to, and updating the transformation pipeline; and regenerating the output (the button for which should maybe be with the other buttons).