Slapyak has an interesting tutorial on creating a Guitar Hero MIDI controller. With the current version you can: play 2 octaves of an 8 note scale at a time change the starting note anywhere in the range of a regular keyboard change octaves change keys change tonal modes (Ionian, Mixolydian, Lydian, Dorian, Aeolian, Phrygian, Locrian) change the timbre of a sound change the resonance of a sound use the whammy bar to pitchbend play chords in the mode you have the guitar set to (major/minor/etc.) rock out with a video game toy Here’s a high-level flow for the MIDI controller: Guitar ?> Arduino ?> LEDs & MIDI ?> external MIDI device. Details are available at the Slapyak site. Here’s a short video of the Guitar Hero MIDI controller in action:

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