Download free Part of NULL JSFX 2.6.1: 113 plugins, free and open source (MIT). Easiest with NULL JSFX Hub.

Listen

The same music with the Vintage Amp Trem preset and without the plugin. Switch while it plays.

Controls

  • Rate0.1 to 20 Hz — Speed of the LFO (when Tempo Sync is Off).
  • Depth0 to 100% — Modulation amount; the gain dips from full level down to 1 − Depth, so 100% goes fully silent at the trough without flipping polarity.
  • Mix0 to 100% — Blend between dry and modulated signal.
  • ShapeSine / Triangle / Square / Saw Up / Saw Down — LFO waveform: Sine, Triangle, Square (edges softened to avoid clicks), Saw Up or Saw Down.
  • Tempo SyncOff / 1/1 / 1/2 / 1/4 / 1/8 / 1/16 / 1/32 / 1/4T / 1/8T / 1/16T / 1/4D / 1/8D — Locks the LFO to the host tempo at the chosen note value (straight, triplet or dotted) and to the beat grid while playing; Off uses Rate.
  • Stereo Phase0 to 180 deg — Offsets the right channel's LFO; 180 degrees turns the tremolo into an auto-pan.
  • ModeClassic / Harmonic — Classic modulates the whole signal; Harmonic splits it at about 800 Hz and moves lows and highs in opposite phase, like a vintage harmonic tremolo.

Best uses

  • Vintage amp tremolo on guitars
  • Pulsing pads and keys
  • Rhythmic movement on sustained notes
  • Choppy effects at high rates

Properties

Input → gain of 1 − Depth × (0.5 − 0.5 × sine LFO), always between 0 and 1 → Dry/Wet Mix → Output. Same modulation on both channels; 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

Vintage Amp Trem · Surf Guitar · Slow Pulse Pad · Subtle Keys Shimmer · Choppy Fast Trem · Harmonic Trem · Surf Trem · Synced Chop · Slow Pan · Synced Auto-Pan · Saw Pump Eighths · Triplet Pulse · Wide Harmonic Swirl

In the FX chains and Rack presets

Desert Twang

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.