Lex Rotary – Rotating Speaker Effects Pedal – Rotary Pedal - Strymon


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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
  • Fast Rotor Speed adjusts the rotational speed of the effect when spinning in Fast mode.

    Go from a relaxed 4Hz rotation to a frenetic spin of greater than eight rotations per second.
    Mic Distance varies the placement of the microphones at the horn (stereo pair) and rotor (single mic).

    Choose from up close, tight and intense, to distant miking with evened-out fluctuations.
    Preamp Drive overdrives the input feeding the rotary speaker effect.

    Harmonics are created that add growl and fatness, adding a whole new dimension when set into motion.
    Horn Level allows you to adjust the horn volume.

    Adjust in conjunction with Mic Distance to find the desired amount of high-end, and to match the sound with your particular setup.
    Slow/Fast Footswitch – Changes the motor speed from fast to slow. Press and hold for rotary brake.
    Bypass Footswitch – Engages and disengages effect. Bypass mode is true bypass.
  • Slow Rotor Speed adjusts the rotational speed of the effect when spinning in Slow mode.

    At minimum Slow Rotor setting, the speed is zero, or “braked”, so you can set up a one-speed rotary system that switches between fast and stationary.
    Cab Direction changes the position of the cabinet relative to the microphones.

    In the Front orientation (knob turned left), the mics capture the sound as it travels through the louvers in the wood cabinet. In the Rear orientation (knob turned right), the mics capture the sound from the open side of the cabinet.
    +/- 6dB Boost/Cut allows balancing the output level under all conditions. Achieve a plus or minus 6dB boost or cut when the pedal is engaged.
    Acceleration Time varies the time it takes for the Lex rotating assembly to speed up and slow down.

    Set a quick acceleration if you're interested in the destination, or select a slower acceleration if you think the fun is in getting there. At all settings, the drum will take longer than the horn to reach its final speed.
  • Input – Plug your instrument in here. Default is mono input. Can be used as TRS stereo input by switching internal jumper.
    Exp – Connect an expression pedal and control any one knob with your foot. Or plug in a favorite switch to save and recall a preset or use as an external speed switch.
    Left Output – Connect to your amp, mixing board, other pedals, etc. Acts as a mono output when only one channel is being used.

    If using optional Bi-Amp mode, the Left Output is the rotary horn.
    Right Output – Connect to your amp, mixing board, other pedals, etc.

    If using optional Bi-Amp mode, the Right Output is the rotary woofer.
    Power – Maximum 9 volts DC center negative, with a minimum of 250mA current.


  • Slow/Fast Switch
  • Rotary Brake
  • Bi-Amping
  • Expression Pedal
  • Change between Rotor Speeds

    Alternate between a slow and fast rotor speed. Ramp up and slow down with the press of a switch.

  • Press and Hold for Rotary Brake

    Press and hold the Slow/Fast switch to put the brakes on. The Lex rotary will wind down and stop. When at rest, the horn and drum “brake angle” is optimally positioned for consistent results. Release the Slow/Fast switch and the rotary will begin to spin.

  • Rotating Speaker Bi-Amping

    Lex provides you with a selectable Bi-Amp mode to send bass rotor signal out to the Left output, and the treble horn to the Right output. Stack two cabinets and add another dimension to your sound.

  • Expression Pedal

    You get an expression pedal input with assignable control over any front-panel knob parameter. When set to Fast Rotor Speed, you can sweep and ramp all the way from the “braked” position up to a selectable speed.


  • In-Depth Video
  • What's Happening Inside?
  • Rotary Speaker / Leslie Speaker diagram

    Lex rotary delivers a faithful reproduction of the entire rotating speaker system. It’s all here—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. Read our Rotary Speaker Technology white paper to learn more.


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

    • Hand crafted rotary algorithms faithfully deliver the signature, three-dimensional rotating speaker experience
    • Extensive control over rotating speaker mechanics and configuration
    • Four rotary adjustment and tone shaping knobs:
      Fast Rotor Speed, Preamp Drive, Mic Distance, Horn Level.
    • Four “hidden” knobs for extensive tone tweaking:
      Slow Rotor Speed, Cab Direction, Acceleration Time, +/- 6dB Boost/Cut.
    • Instantly alternate between a fast and slow rotor speed with the Fast/Slow footswitch
    • Selectable Cab Filter allows for an optimal experience in front of guitar amplifiers and full range systems
  • Ins, Outs, Switches

    • Stereo output
    • High impedance mono input (internal jumper enables selectable TRS stereo input) Please read this FAQ for more info on the TRS input.
    • Expression pedal input with selectable control over any knob parameter
    • Connect our optional Favorite switch to save a favorite preset or use as an external speed switch
    • Fast/Slow and Bypass footswitches
    • Press and hold Fast/Slow footswitch for Rotary Brake
    • Selectable Bi-Amp mode splits bass rotor and treble horn signals to separate outputs
  • Audio Quality

    • Ultra low noise, high performance 24-bit 96kHz A/D and D/A converters
    • 110dB typical signal to noise
    • Premium analog front end and output section
    • Super high performance DSP in a compact form factor
    • 32-bit floating point processing
  • More

    • True Bypass (electromechanical relay switching)
    • Powered with a standard 9V center negative DC supply. 250mA minimum
    • Strong and lightweight mahogany anodized aluminum chassis
    • Crafted with love in the USA


  • ...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.