There’s one thing that I find pretty annoying on the A4, and that is the fact it keeps the last kit when switching to a new pattern. Every time I want to make a little jam, I have to save the kit first to a new slot. Every time I forget to do that, my previous pattern is skrewed because the sounds all changed.
I would really like to have an empty kit assigned when I choose a new pattern. In the rare case you’d want to use the same kit, you can load that kit thru the menu.