The Trautonium.
A synth inventied in 1930 which uses radio tubes, and neon light tubes to create oscilating tones and harmonics.
https://m3.gab.com/media_attachments/d8/db/38/d8db386742f0f14820d71d5729aec257.mp4
Discussion
wow that was great. love the warm tone. thanks for sharing.
Made for a humans touch, benefits from a humans touch. Simple as writing on paper. Not to knock it, its beautiful, and I would kill to have that thing. But most of humanity wouldn't have given that video a play
sounds a lot like a theramin