Ethan Ham's robotic slide whistle
Ethan Ham built this motorized, vocoder-inspired slide whistle out of parts from an ink jet printer. It responds to sound input like a vocoder and responds with a pleasing whistle in kind.
In the above video, Ethan shows it off at Brooklyn's fantastic LEMURplex art space.
Study for a Vocoder [EthanHam.com]

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If he spent more than 1 day on making this thing it was a waste of time...
That's rude and unnecessary, fibreoptik.
Sigh, fibreoptik. Looks like SOMEBODY needs to take the A-train. Let's see how you feel once you're on Sugar Hill in Harlem.