A 2 string, amplified feedback instrument. The strings, stretched across the speaker, are picked up by 2 small magnetic pickups. The signal is fed to a small mixer and a guitar amplifier and back to the speaker. The strings rest on off-center wheels that are driven by Arduino / MIDI controlled servo motors (not shown in this video, waiting on an Arduino Nano board to come in the post to finish the wiring). These servos tighten or loosen the strings, thus changing pitch.
In this video I was experimenting with the rhythmic possibilities off bouncing things off the speaker (in this case, 2 jack plugs).
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