If you have an iPad or Android tablet, check out this app. I've been messing with it for almost an hour now and it's quite possibly the most entertaining app I have come across. It was co-developed by keyboard GOD Jordan Rudess, which should be convincing enough to try it.
It works similarly to the Haken Continuum in that finger position and movement control the sound. It comes with a TON of presets as well as user controlled variables.
Anyway, just thought I would share. It's not often that I come across an app as cool and unique as this.