Availability: In stock.
Ships same day, or next business day.

Born to Revolve.

When we decided to create a studio-class pedal that faithfully recreates the classic, unmistakable sound of the most sought-after rotating speaker system, we prepared to study every nuance and finest detail. The Strymon sound design labs have been filled with those signature, swirling, three-dimensional sounds, as we painstakingly analyzed and recreated the physics and mechanics behind these systems.

Lex Rotary Speaker Simulator

The complete rotary system.

Lex provides you with a complete, accurately reproduced rotary system: the low-frequency bass rotor, the rotating treble horn, the tube-driven amplifier, finely tuned microphone placement, and all the complex sonic interactions between these elements.

Utilizing a ridiculously powerful SHARC DSP, every drop of processing power is harnessed to authentically represent these details.

Leslie Rotating Speaker System Diagram


Extensive control.

You get eight parameters to tweak, allowing extensive control over the tonality and mechanics of the rotating speaker system. You can manipulate each element, from rotor speed, horn level, acceleration time, microphone distance, tube drive and saturation, and volume level.

Go from a maelstrom of dramatic, up-close, sweeping and swirling sounds, all the way to mellow, tranquil and calming undulations. All of this without a giant cabinet, microphone setup, and costly motor maintenance.


  • Sound Clips
  • Keyboard Demo
  • Audio Samples

    • Mellowed Out
      With the Mic Distance at maximum, the amplitude modulations are mellowed out. Adding a little more horn signal adds emphasis on the doppler reflections. The speed is varied to get the sense of the mechanical aspect that controls the motion.
    • Rotary Brake
      This clips starts with the brake engaged, and then releases and re-engages the brake to show how naturally the system starts and stops. The system comes to rest at a 'zero degrees' angle for consistent and sonically optimum results.
    • Fat Harmonics
      Bringing the mic up close creates a high amplitude modulated signal from the horn. Rich, fat harmonics are created by moderately overdriving the preamp with the Preamp Drive control.
    • Classic Ballad
      A jangly strat gets fattened up by driving the preamp and reducing the Horn Level slightly. Slow speed and medium Mic Distance settings combine to create a classic sound for ballads.
    • Maximum Drive
      Maximum preamp drive with close-up miking creates heavy harmonic content with lots of amplitude modulation. A big stereo spread when spinning slowly, and a choppy tremolo-like effect at fast speeds.
    • Swirly Horn
      Increasing the Horn Level adds emphasis on the high end. Minimum preamp drive creates a clean signal to get worked on by the rotating machinery.
    • Distant Miking
      Distant miking with added Horn Level creates a nice watery effect. Minimum preamp drive keeps things clean.
    • Dramatic Stereo Sweep
      Close miking with moderate Drive followed by maximum Drive. The growl is present along with the dramatic stereo sweep in slow speed and 'choppy' horn character at fast speed.
    • Clean Classic Rotary
      Mic is moved back a little, minimum Preamp Drive for a clean classic rotary suitable for comping and grooving.
    • Mellowing Effect
      The Mic is moved from up close to further back, and then even further away to demonstrate it's 'mellowing' effect as it moves away from the rotary speaker.
    • Simple Progression
      A simple progression with a classic rotary sound.
    • Mellow Revolver
      Fast Rotor Speed is set to 9:00 for a medium rotational speed. Preamp Drive is reduced for a mellower and less growly tone. Horn Level is at a lower level for evened-out fluctuations. Slow/Fast switch is pressed at the :15 mark to slow the machine down. Slow/Fast is pressed again :23 to speed up the machine.
    • Rotating Drive
      A moderate amount of Preamp Drive is employed here for a more tube-driven tone. Slow/Fast switch is pressed at various times to slow down and speed up the system.
    • Swirly
      Preamp Drive is set to just above half to introduce in a good amount of tube drive and saturation. Horn Level is set in the middle for an evened-out sound.
    • Playing With Speed
      Acceleration Time is set to the fastest setting for a rotating speaker system that quickly switches from fast speed to slow and back. The Slow/Fast switch is pressed at various times to generate complex rotary sounds that occur when the system is in transition between speeds.

Tone Shaping

Press (+) for more info.
  • Front Panel Controls
  • Secondary Functions
  • Ins & Outs


  • Slow/Fast Switch
  • Rotary Brake
  • Bi-Amping
  • Expression Pedal


  • In-Depth Video
  • What's Happening Inside?


  • Sound Design
  • Ins, Outs, Switches
  • Audio Quality
  • More


  • ...they set out to create the most authentic sounding rotary simulator and in my humble opinion I think they’ve done it. Highly recommended!
  • The Lex nails a host of rotary speaker tone, but it also delivers a lot of the response and feel of playing one in impressive fashion.
    Premier Guitar
  • The Lex Rotary was designed with a painstaking focus on details and the complexity of a rotary cab and look no further people – this is as close as you’ll get to fit a Leslie in a box!
  • The Lex is fun, and it sounds brilliant.
    Total Guitar
  • The preamp drive is pretty remarkable in terms of the accuracy of its tone and vibe.
    Phil O'Keefe
    Harmony Central
  • Standing in front of the stereo setup you can hear how incredibly dynamic and sophisticated the Lex is.
  • I’ve heard a lot of simulators over the years that have tried to nail the sound of a rotating speaker, and the Lex is right up there at the top of that list.
    Phil O'Keefe
    Harmony Central
  • If you’re the type of player who likes to ‘work the switch’ a lot rather than leave it at one speed all the time, you’re going to really like the Lex. It does those all-important transitions between speeds beautifully.
    Phil O'Keefe
    Harmony Central
  • If you're looking for an extremely natural-sounding rotary speaker emulation in a decent-sized stompbox, you'll find it in the Lex.


Lex Rotary – Rotating Speaker Effects Pedal – Rotary Pedal

Lex provides you with a complete, accurately reproduced rotary speaker system: the low-frequency bass rotor, the rotating treble horn, the tube-driven amplifier, finely tuned microphone placement, and all the complex sonic interactions between these elements.


Availability: In stock.
Ships same day, or next business day.