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ROTARY SPEAKER

Leslie Rotary Simulation

Download free Part of NULL JSFX 2.5: 113 plugins, free and open source (MIT). Easiest with NULL JSFX Hub.

Listen

The same music with the Organ Chorale preset and without the plugin. Switch while it plays.

Controls

SpeedSlow (Chorale) / Fast (Tremolo) / Stop — Rotor speed: Slow (Chorale), Fast (Tremolo) or Stop
Acceleration10 to 400% — Scales how long the rotors take to change speed
Horn/Drum Balance0 to 100% — Balance between the horn (highs) and drum (lows)
Drive0 to 100% — Tube-amp style overdrive before the rotors
Width0 to 100% — Angle between the virtual left/right mics
Mix0 to 100% — Dry/wet blend

Best uses

Classic organ rotary sound
Swirling guitar and electric piano
Speed-ramp transitions via automation
Stereo movement on pads and vocals

Properties

Signal chain: Input (summed to mono) → Drive → 800 Hz Crossover → Horn (0.8/6.7 Hz) + Drum (0.7/5.8 Hz) with AM and Doppler → Two Virtual Mics → Mix → Output. Rotors ramp with inertia (horn ~0.7 s, drum ~3 s, scaled by Acceleration); zero latency.

Formats

JSFXJSFX for REAPER, with REAPER's own sliders
GFXJSFX GFX for REAPER, with its own interface
VST3VST3 for any DAW
CLAPCLAP for any DAW

Factory presets

Organ Chorale · Organ Fast Tremolo · Gritty Rock Organ · Slow Ramp Transitions · Guitar Swirl · Keys Gentle Spin · Vocal Movement

In the FX chains and Rack presets

Organ Rotary

See every FX chain

Try it

Try it on orOS StudioAdd it to a track in your browser, with its own interface. Nothing to install.