It is my toy project for google wave.

It is one form of "ano-gakki" that can play together with other wave surfers.

For those who don't know ano-gakki, it is on http://www.youtube.com/watch?v=NO7IOCVsCnk (it existed only virtually, until Japanese net geeks started to "create" such instruments).

The sound engine is based on SiON sound generator / MML compiler.
http://www.libspark.org/wiki/keim/SiON

On google wave, it is "publicly" accessible (that means, only to those who can access to wave.google.com) at:
https://wave.google.com/wave/?pli=1#restored:wave:googlewave.com!w%252Bs3hGeKZWB

It's on the wave samples gallery too:
http://wave-samples-gallery.appspot.com/about_app?app_id=98011