COMB FILTER

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Controls

• Frequency20 to 20000 Hz — Fundamental of the comb; delay time is one period of this frequency, with peaks at it and its harmonics
• Feedback0 to 0.99 — Amount of the delayed copy added back; higher values give sharper, more resonant peaks
• ModeFeed-Forward / Feed-Backward — Feed-Forward adds a single delayed copy; Feed-Backward recirculates the delay for a ringing, pitched tone
• Gain−12 to +12 dB — Output level, applied after automatic level compensation

Best uses

• Add metallic, pitched resonance to drums and percussion
• Tune noise or hats to a musical note
• Create Karplus-style plucked ringing with Feed-Backward
• Hollow, flanger-like coloration on pads
• Sound design for robotic or tube-like textures

Properties

Signal chain: Input → Delay (1 period of Frequency, interpolated) → Feed-Forward or Feed-Backward sum → Level Compensation → Gain → Output. Output is normalised by 1/(1+fb) or (1−fb) so high Feedback does not blow up; stereo channels processed independently, 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

Hollow Pad Color · Subtle Phasey Tone · Metallic Snare Ring · Tuned Hat Shimmer · Karplus Pluck A2 · Tube Resonance · Robotic Buzz

In the FX chains and Rack presets

Cosmic Space · Mid/Side Drive

See every FX chain

Try it