The Theremuino is an infra-red theremin. It uses an Arduino microcontroller programmed with a modified version of the Auduino grain synth.
The performance Theremuino in the video has an infra-red sensor for pitch, and controls for grain delays, speed and volume. It has two modes - polite and rude - which respectively sound melodic and rhythmic/noisy. It's built into an Electro-Harmonix guitar effects pedal box.
I built two simplified Theremuinos for inclusion in the Circus Kinetica bar for Secret Garden Party 2010, with the controls mounted in the bar top.
More about Auduino here: code.google.com/p/tinkerit/wiki/Auduino
More about Theremuino, including circuit diagram and code: evolutionaryart.co.uk/theremuino.php
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