A bass speaker is mounted lower in the unit, inside of a rotating drum with a narrow aperture for sound to escape.Fluctuations in pitch and loudness are ultimately the result of the treble speaker’s and drum aperture's distance from the listener. The Leslie speaker was originally designed and voiced for the Hammond organ, and almost no Hammond organist worth his salt will be seen traveling or playing without one. He wanted that massive, quivering sound he heard on pipe organs in churches and movie halls.Channeling his experience in mechanics and electrical engineering from his stint at the National Research Laboratories in Washington D.C. during World War II, Leslie started tinkering with a design for a new type of amplification system that could emulate that warble.By 1940, he had a prototype of his rotating speaker system and approached the inventor of the Hammond organ, Laurens Hammond. We associate the sound of the Leslie with the Hammond so much that when plugging a guitar into a Leslie, a listening layman would most likely say, “Wow! He started selling them under a variety of brand names in 1941 and started marketing them under his own name in 1947.The speaker was selling so well that Leslie had no need to advertise. It was specifically designed for the Hammond organ and is the model most commonly identified with it. After demonstrating a prototype with A chord is played on the organ while the Leslie speaker is switched from "chorale" to "tremolo" and back again

As fascinating as the technology was, Don was ultimately disappointed by the organ’s sound. As fascinating as the technology was, Don was ultimately disappointed by the organ’s sound. Most modern keyboards that emulate the Hammond organ also include a Leslie simulator, including Hammond's own XK-3c and the Leslie never advertised his speakers. Self–contained Leslie–style effects were quickly welcomed, with their controls and and functionality providing a good substitute for the burdensome speaker cabinet.In one relatively small effect, you could directly control the signal’s gain or use an expression pedal to manipulate the effect’s rate.

Modifications with a pre–amp were necessary in order to use the early Leslie models with a guitar or microphone.It’s important to stress that the Leslie speaker isn’t a “hi–fi” speaker like a studio monitor. Instead, it’s an emulation of an emulation of a Leslie. The rotation causes sound sources themselves to grow nearer to and farther from the listener, even while these sound sources are housed in a stationary cabinet.Those speakers’ rates can be varied to make the effect more or less intense, with the faster setting giving the Leslie its most distinct sound.In the late 1930s, Donald Leslie brought an electric Hammond organ home. The inclusion of a toggled overdrive circuit is fantastic for adding character and grit to the emulation.The Viscous vibe is not an emulation of the Leslie. It was meant to color and affect an audio signal, much like a guitar amplifier or effect pedal.The most popular models—the Leslie 122, 145, and 147—used low–wattage amplifiers that could be easily overdriven, primed for the thick and dirty organ sounds made famous in the rock ‘n’ roll era by The Band’s Garth Hudson and Deep Purple’s Jon Lord.The Leslie were easily and often hot–rodded: drivers could be disabled, crossovers re–installed, the amplifier disengaged or replaced. It is 41 inches (1,000 mm) high, contains separate motors for The 147 is the "universal" version of the 122, designed for many organs, and has a different amplifier input and motor speed control, but is otherwise identical.By the late 1960s, gigging musicians were finding that older Leslies like the 122 were not loud enough for large venues, which led to the introduction of the "Pro Line" series. Please check the fields highlighted in red. The first model of Leslie produced was the 30A. This added an obstacle to using the Leslie for something other than an electric organ.The Leslie also required a line level signal, meaning that passive instruments needed a signal boost in order to sound through the speaker.

Electronic designed this pedal to replicate the sound of the Shin–Ei Univox, bringing a faithful recreation of that beloved pedal's sound down to a price point that’s around a 20th of the original’s current market value.Hey! The initial models of Leslie speakers did not have the "chorale" setting. This pedal rivals the Neo Ventilator for accurate imitations of the rotating speaker sound while giving the user unique control over the dry and wet feeds.In typical Electro–Harmonix fashion, this rotary speaker emulation wins on tweakability, making it the most versatile on the list. Because the Leslie is a sound modification device in its own right, various attempts have been made to simulate the Leslie worked as a radio service engineer at Barker Brothers Department Store in Los Angeles, which sold and repaired Hammond organs.By 1940, Leslie decided his prototype was ready to market, and went to the Hammond Organ Company to demonstrate it.

The first model of Leslie produced was the 30A. The TC circuit responds to the dynamics of the input signal, giving a gentle or harsh response depending on how the instrument is played. There is also a knob to affect variation in speed (as opposed to having just a fixed rate) and an expression pedal input for controlling rotation speed, in the vein of the Uni–Vibe.The Rototron is designed to specifically emulate the Leslie 122 and 147 cabinets. It offered separate Vibrato and Tremolo modes with adjustable repeat time, intensity, and volume. Don took a horn speaker and made it … The audio signal enters the amplifier from the instrument. This is the Doppler effect, or the phenomenon of sound changing in pitch as it grows nearer or farther away.The Leslie speaker accomplishes the Doppler effect with a stationary unit through clever engineering. A popular recommendation is two While the Leslie speaker is still made and sold, similar effects can now be obtained via analogue electronic devices and digital emulation.

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