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These instruments include the Solovox, Multimonica, Ondioline, and Clavioline.In the late 1940s, Canadian inventor and composer, Hugh Le Caine invented the Electronic Sackbut, a voltage-controlled electronic musical instrument that provided the earliest real-time control of three aspects of sound (amplitude, pitch, and timbre)—corresponding to today's touch-sensitive keyboard, pitch and modulation controllers.During the three years that Hammond manufactured this model, 1,069 units were shipped, but production was discontinued at the start of World War II.
Though it lacked an arbitrary sound-synthesis function, some have erroneously called it the first synthesizer.
Cahill's business was unsuccessful for various reasons, but similar and more compact instruments were subsequently developed, such as electronic and tonewheel organs including the Hammond organ, which was invented in 1935.
In the 1980s, the invention of the relatively inexpensive Yamaha DX7 synth made digital synthesizers widely available.
1980s pop and dance music often made heavy use of synthesizers.
In 1949, Japanese composer Minao Shibata discussed the concept of "a musical instrument with very high performance" that can "synthesize any kind of sound waves" and is "...operated very easily," predicting that with such an instrument, "..music scene will be changed drastically." After World War II, electronic music including electroacoustic music and musique concrète was created by contemporary composers, and numerous electronic music studios were established around the world, for example Studio for Electronic Music (WDR), and Studio di fonologia musicale di Radio Milano.
These studios were typically filled with electronic equipment including oscillators, filters, tape recorders, audio consoles etc., and the whole studio functioned as a sound synthesizer.Most of these early instruments used heterodyne circuits to produce audio frequencies, and were limited in their synthesis capabilities.The ondes martenot and trautonium were continuously developed for several decades, finally developing qualities similar to later synthesizers.The controllers were initially implemented as a multidimensional pressure keyboard in 1945, then changed to a group of dedicated controllers operated by left hand in 1948.It may have been similar to another electrostatic reed organ, the Orgatron, developed by Frederick Albert Hoschke in 1934 and then manufactured by Everett and Wurlitzer until 1961.Synthesizers were first used in pop music in the 1960s.In the late 1970s, synths were used in progressive rock, pop and disco.The Warbo Formant Orgel developed by Harald Bode in Germany in 1937, was a four-voice key-assignment keyboard with two formant filters and a dynamic envelope controller.The Hammond Novachord released in 1939, was an electronic keyboard that used twelve sets of top-octave oscillators with octave dividers to generate sound, with vibrato, a resonator filter bank and a dynamic envelope controller.He accidentally discovered the sound generation from a self-vibrating electromechanical circuit, and invented a basic single-note oscillator.This instrument used steel reeds with oscillations created by electromagnets transmitted over a telegraph line.