via this auction"This is a mint condition Thingamagoop 1: An analog VCO (voltage-controlled oscillator) activated by a photo cell. It'll work with an internal speaker, or plugged into an amplifier.
You use the light at the top of the system to interact with the photo cell while using the knobs to control the wave shape and frequency.
This was manufactured by Bleep Labs: http://bleeplabs.com/"
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