Leslie cabinet

 A type of loudspeaker cabinet, developed by Don Leslie in the 1930’s and used in electronic (especially Hammond) organs. The sound from fixed transducers is dispersed via a rotating horn or (for bass speakers) an aperture in a rotating chute. This causes a continuously varying Doppler shift of the pitches in the audio signal, which mixes, with some phase cancellation, to give a swirling, chorus-like effect.

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