The Leslie

The Leslie, named after its inventor, Don Leslie,^4.8is a popular audio processor used with electronic organs and other instruments [54,174]. It employs a rotating horn and rotating speaker port to ``choralize'' the sound. Since the horn rotates within a cabinet, the listener hears multiple reflections at different Doppler shifts, giving a kind of chorus effect. Additionally, the Leslie amplifier distorts at high volumes, producing a pleasing ``growl'' highly prized by keyboard players.

The Leslie consists primarily of a rotating horn and a rotating speaker port inside a wooden cabinet enclosure [174]. We first consider the rotating horn.