Metal Scrape Swell

A screeching bowed-metal swell with a rising pitch and dissonant overtones for horror and thriller cuts

one-shot · 3.45 s · 0 downloads · 0 likes

0.00 / 3.45 sMP3 preview · default

Preset

Show spectrogram

Free for commercial use. No attribution needed.

Tweak

renders in the CLI · WAV

Change parameters to build an exact command. Your agent runs it with sb and gets the WAV.

Command

$ sb get H0F690KKAE@1 -o metal-scrape-swell.wav

Source: a hard bow or scraper dragged over a sheet of metal. Stick-slip friction drives the plate: a bowed tone with a slowly wandering, rough amplitude, plus a band of scraping noise that brightens with speed.
Body: a thin plate rings in inharmonic modes (ratios ≈ 1 : 1.51 : 2.37 : 3.12 : 4.28 : 5.9), so the partials beat against each other and sound dissonant; noise is shaped by a resonator at the same modes (Q ≈ 40).
Envelope: pressure and speed grow together, so level swells on a curved ramp to a peak at ~85 % of the length, pitch rises up to ~1.6 octaves and the scrape band opens from 1.5 kHz to 6 kHz; a short release ends it.
Variation: `rng` detunes each mode by ±1.5 % and wanders the bow pressure; partials sit at different pan angles.
Layers: sine partials (tone), resonated noise (bowed grain), band-passed noise (scrape), all kept dry.

Parameters
Parameter	Range	Default	Unit	Controls
length	1.5 – 4.5	3	s	Length
pitch	200 – 1200	520	Hz	Start pitch
rise	0 – 1	0.6	—	Pitch rise
roughness	0 – 1	0.5	—	Roughness
scrape	0 – 1	0.4	—	Scrape noise
dissonance	0 – 1	0.6	—	Dissonance
seed	int	1	—	Variation, reproducible

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.

Revision history1