Fex Audio on Instagram: "The Ondioline is one of the earliest monophonic (single-note) electronic synthesizers, invented by French inventor Georges Jenny in the 1940s. Designed to be an affordable, versatile instrument that could emulate various acoustic instruments, it features a unique spring-mounted, side-to-side vibrato keyboard, a knee lever for volume control, and built-in filters and sub-octave dividers. Jean-Jacques Perrey , was a French electronic music performer, composer, producer, an