“The proof of concept test for the THERMATRON, a vacuum tube synthesizer controlled by a flame. Created and built by Lorin Edwin Parker at electricwestern.
The right mixture of gas, air pressure, high voltage, chemical ions and heat vary the flow of current through a flame. This current feeds into the grid and / or plate of vacuum tubes controlling an Electric Western Phantastron Synthesizer.”

“The Wurlitzer Sideman was the first electronic drum machine ever produced (if you don’t count tape loops), sold as a Wurlitzer organ accessory beginning in 1959. It’s got some fantastically great sounds and the ’sequencer’ is actually a wheel covered…”

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http://www.synthgear.com