The Korg Kaossilator and mini-KP are very cool little gadgets. I have a couple and I intend modifying them to make something even more useful.
Modding the Kaossilator:
Externalize the buttons using the spare room at the top – including videos.
http://kaossilator.wordpress.com/
Great internal pics of the Kaossilator in high res also on his site.
Using that Mod:
and here’s a guy (James Haskin) who has done the mod and has used the 4 buttons on a Guitar Hero controller to make a very cool hack 🙂
http://www.youtube.com/watch?v=Lns8Sf5e-2Q
Add a Grid to the pad:
http://kgridmod.blogspot.com/
Very useful to get repeatable performances