I have always been a fan of these toy drums. With just a potentiometer they can create a range of sounds from filthy aliased low end bass to frantic high pitched slices. I wanted to sequence them with an external source, so I installed a DB-9 jack that connected to the four separate drum sounds. Working with Sean we wired this through some transistors to an Arduino with a MIDI shield and controlled the whole thing with a Max sequencer Sean built.
Sean has an excellent in depth write up of the project and a github link to his code so you can make it yourself --> here.
We have a video and straight audio recording, which interestingly sounds very different from each other.