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SPECTRAL FREEZE

FFT Spectrum Freeze

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 Smooth Drone preset and without the plugin. Switch while it plays.

Controls

FreezeOff / Frozen — Captures the current spectrum and holds it as a sustained texture
Fade10 to 3000 ms — Crossfade time into and out of the frozen sound
Smear0 to 100% — Phase randomisation: 0% tonal and buzzy, 100% smooth and airy
Level−24 to +12 dB — Level of the frozen sound
Mix0 to 100% — Dry/wet blend

Best uses

Infinite sustain on chords and notes
Drones and pads from any sound
Freeze reverb tails for transitions
Ambient layers under a mix

Properties

Signal chain: Input → 2048-Point FFT (4× overlap) → Magnitude Snapshot on Freeze → Phase Advance + Smear → IFFT Overlap-Add → Level → Mix → Output. Freezes only after a full 2048-sample window; stereo channels independent.

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

Smooth Drone · Tonal Snapshot · Quick Transition Hold · Ambient Layer · Slow Swell Pad

In the FX chains and Rack presets

Cosmic Space · Wall of Sound

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.