The Casio SK-1 was one of the cheapest sampling synths on the market when it was released. It has since become a popular target for circuit benders. Check out this awesome SK-1 mod with custom case and panel. You may remember reader [jumpstart]‘s bent SK-1 as well. Make even had a article on the SK-5. If you don’t want to chop up your keyboard too much, [mike] pointed out that you can add your own MIDI-in port with minimal work. Highly Liquid even offers the parts as a kit.