For those of you who are interested in building your servo-electric guitars, take a look at this awesome single-string servo-electric guitar using Arduino and servo motors.
A guitar string synthesizer driven by a midi channel to play a rock version of the Japanese folk song Sakura (with background midi accompaniment). The design is described in more detail at the servoelectricguitar website and includes autotuning that makes small tuning corrections over time to keep the instrument in better tune.
Other interesting stuff at Zedomax.com: build, guitar-hack, how-to, servo-electric guitar, single string guitar
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