This is incredible: A professional restorer has painstakingly recreated a Hupfeld Phonoliszt-Violina, something I didn’t even realize existed until now — like a giant player piano but with violins:
Three violins (each with only one active string) mounted vertically were played by a round rotating bow made of 1300 threads of horse hair, according to the program on the roll of perforated paper. The small bellows replaced the violin player’s fingers, pressing on the strings to obtain the necessary notes. The piano can be driven either unaccompanied or together with the violins. It controls 38 accompaniment keys with 12 high notes (one octave) in extension. The whole pneumatic systems are controlled by an electric engine of uninterrupted current.
Source: A Beautifully Restored Hupfeld Phonoliszt-Violina, A Self-Playing Mechanical Violin Orchestrion Player