One Slider

CHORUS ONE

One-Knob Stereo Chorus

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 Lush Eighties preset and without the plugin. Switch while it plays.

Controls

Chorus Amount0 to 100 — Scales the whole chorus at once: 0 is dry, higher values speed up the LFO (0.3 to 2.8 Hz), deepen the modulation (1 to 8 ms), lengthen the delay (5 to 12 ms), add light feedback and raise the wet mix to 85%

Best uses

Thicken clean guitars
Widen synth pads
Add movement to electric piano
Subtle stereo shimmer on backing vocals
Lush 80s-style chorus at high settings

Properties

Input → L/R modulated delay lines (triangle LFO, opposite polarity per side) with feedback → dry/wet blend → Output. The single slider drives rate, depth, base delay, feedback (0–0.15) and mix (max 85% wet); 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

Subtle Shimmer · Clean Guitar Chorus · Electric Piano · Wide Pad · Lush Eighties

In the FX chains and Rack presets

Retro Bus · VHS Tape

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.