The 1948 Sackbut Demonstration Tapes (1953) are narrated by Le Caine, and illustrate well-known wave forms (square, pulse, sawtooth) played with the touch-sensitive keys and timbral controls of the Sackbut, now recognized as the “first” analogue synthesizer. The Sackbut is accompanied by piano and the prototype Touch Sensitive Organ, the tracks combined using the prototype Multi-track Tape Recorder.
Rhapsody in Blue (G. Gershwin) (0:58) The Sackbut plays the clarinet part using only a square wave and the touch-sensitive keyboard.
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Also part of Compositions Demonstrations 1946-1974 .