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The Electronic Sackbut is an electronic instrument designed by Hugh Le Caine beginning in the 1940s.
The Electronic Sackbut had a feature which resembles what has become the modulation wheel(s) on today's synthesizers: The player used the left hand to modify the sound while the right hand was used to play the keyboard. This compares with today's synthesizers which have one or several modulation wheels to the left of the keyboard (often controlling modulation and pitch).
The controller, which the player of the Electronic Sackbut used, modified volume, pitch, and timbre. Thus it was one of the first electronic instruments to use a three-dimensional continuous controller to modify the sound in a live situation. Such control sophistication is still rare in today's electronic instruments.
Le Caine began working full-time in a new lab at the National Research Council of Canada in 1954, where he built over 20 different new instruments before his death in 1977. While he developed four models of the Electronic Sackbut, none ever saw commercial production.