One Slider

SPREAD

Mono-Safe Stereo Widener

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 Wide Pad preset and without the plugin. Switch while it plays.

Controls

Amount0 to 100 — Width of the added side content: 0 is unchanged, 100 adds the decorrelated signal at 70% level for a clearly wider image

Best uses

Widen mono synths and guitars
Open up a vocal bus
Mono-safe width on the master
Spread pads and ambiences
Keep bass centred while widening the top

Properties

Input → mid signal → 250 Hz one-pole high-pass → two delay taps (11.3 ms × 0.6 + 17.9 ms × 0.4) → added to L, subtracted from R → Output. Cancels completely in mono; low end stays centred; 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

Master Width · Vocal Bus Open · Guitar Widen · Wide Pad · Mono Synth Spread

In the FX chains and Rack presets

Ensemble

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.