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Guitar Effects Explained - Rotary Speaker Simulator

by Mark Starlin

The rotary speaker effect is based on an actual rotating speaker system invented by Donald Leslie called the Leslie speaker. It was often paired with a Hammond organ, but in the 60’s guiarists also began using it for the unique tone and effect it gave the guitar. The original leslie speaker cabinet used a two speaker system with a rotating horn and bass woofer drum. This created a cool, swirling effect where the music seemed to move around the room. Obviuosly, guitar pedals can only simulate this rotatry effect, which can be enhanced with a stereo amp setup. Of course you could use an actual Leslie speaker (or one of the newer competitors), but costs are high and it requires lugging around an extra speaker cabinet.

Typical Use

Mainly used with single note arpeggios or occasionally on lead guitar. Think of the guitar break in Badge by Cream or While My Guitar Gently Weeps by the Beatles.

Suggested Units

Here are some Rotary Speaker Simulator pedals that have received good reviews and/or high ratings by players.

  • Boss RT-20 Rotary Speaker Sound Processor
    Boss RT-20 Rotary Speaker Sound Processor

    Guitar legends from Santana to the Beatles have incorporated the rotary speaker into their music. BOSS kept this in mind when creating the RT-20, and by employing their COSM modeling technology, it reproduces classic rotary sounds just like the originals. Adjustable Rise Time, Horn and Bass speed, Overdrive, and more. Not just for the classic swirl, the RT-20 can create unique overdrive and pulsating effects as well. Amazing sound plus a stunning graphical view of the virtual rotors in its display.

    Available At Guitar Center

    Boss RT-20 Rotary Speaker Sound Processor Standard

  • Line 6 MM4 Modulation Guitar Effects Pedal
    Line 6 MM4 Modulation Guitar Effects Pedal

    The Line 6 MM4 Modulation Stompbox Modeler is a single stompbox that packs in models of almost every modulation effect unit you've ever wished you had-16 in all. They include Uni-Vibe, Phase 90, Leslie, CE-1 Chorus Ensemble, MXR Flanger, Dimension D, Tri Stereo Chorus, and many more. You also get 16 factory presets, plus 4 presets for storing your programmed versions, true bypass switching, an expression-pedal input, and stereo inputs and outputs. Controls include Effect Selector, Speed, Depth, Tweak, Tweez, and Mix.

    Available At Guitar Center

    Line 6 MM4 Modulation Guitar Effects Pedal Standard

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