The webapage describes it as:
Simple sinewave synthesizer triggered by an ordinary 16step sequencer. Each triggered step causes a force on the underlaying wave-map, which makes it more cute.
As Kim Ayres explains here
Some of you will already know about this, indeed will probably have it as an iPhone app or something. So far as I can make out, it was created a couple of years ago. But I only found it today. I wanted to put it on my blog so I would be able to find it again any time I wanted to for the rest of my life.
There's some other interesting stuff here too....