Hi - never tried experimenting with one of these personally, but another forum member once posted in the Unbendable machines list that they hadn't had much luck with theirs...
I opened up a 'Blue Man Experience' keyboard today, first of all it was an absolute nightmare to open because of this useless pipe framing it has - I then proceeded to mess around with the circuit board for a couple of hours with only minor results (the board as a crystal on it I think and I managed to get it to glitch out like a really lame voltage crash after trying to calibrate it for hours) if anyone has had any better results let me know!!
Did you ever do anything with yours?