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He tried various combinations of speakers and speeds, and discovered that a single one running at what's now known as the "tremolo" speed worked best.
It is most commonly associated with the Hammond organ, though it was later used for the guitar and other instruments.The only control common to all Leslie speakers is a dial that controls the master volume.This is normally set up once and then left, since the organ's expression pedal normally controls the volume.Leslie recommended playing the organ at full volume with all stops (drawbars) pulled out and adjusting the volume just before distortion occurs.Control of a Leslie speaker is normally catered for by an external two way switch, between two settings marked "chorale" and "tremolo".By 1940, Leslie decided his prototype was ready to market, and went to the Hammond Organ Company to demonstrate it.
Laurens Hammond, however, was not impressed with Leslie's attempt to better his own organ design, and declined to market it.
He initially tried making a cabinet similar to Hammond's, but soon concluded that pipe organs produced a spacially varied sound because of the different location of each pipe.
He set out to emulate this by making a moving speaker.
Suzuki Musical Instrument Corporation subsequently acquired the Hammond and Leslie brands.
Because the Leslie is a sound modification device in its own right, various attempts have been made to simulate the effect using electronics effect units.
The audio emitted by the speakers is isolated inside an enclosure, aside from a number of outlets that lead towards either a rotating horn or drum.