I’ve made some progress on my “Guitar Hero Robot” mod. I dissected a used “Guitar Hero” guitar and wired its inputs to the nifty Arduino Duemilanove . Now the sensor input feeds the notes back into the X-Box.
I tried to keep the cost of this project down. The Arduino does all the filtering of the sensor input, converting a shakey analog signal into an absolute on or off signal (thank you Chris Cordingley).
I will post a How-to along with the source code as soon as I’m finished.