When was the synthesizer keyboard invented?
Synthesizer
In 1959–1960, Harald Bode developed a modular synthesizer and sound processor,[28][29] and in 1961, he wrote a paper exploring the concept of self-contained portable modular synthesizer using newly emerging transistor technology.[30] He also served as AES session chairman on music and electronic for the fall conventions in 1962 and 1964.[31] His ideas were adopted by Donald Buchla and Robert Moog in the United States, and Paolo Ketoff et al. in Italy[32][33][34] at about the same time:[35] among them, Moog is known as the first synthesizer designer to popularize the voltage control technique in analog electronic musical instruments.[35]