The Clavivox was a keyboard sound synthesizer and sequencer developed by American composer Raymond Scott.
[3] Scott's instrument allowed the use of portamento over a 3-octave range, which made it possible for the player to control the synthesizer via a keyboard, but with additional glide, giving it a "human" quality.
Additionally, Scott's design added amplitude envelopes, vibrato and other effects.
"A lot of the sound-producing circuitry of the Clavivox resembled very closely the first analog synthesizer my company made in the mid-'60s," Moog explained years later.
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