Debris Collapse

How it's made

Source

a masonry wall failing. Structural cracking and sliding blocks make a low rumble (brown-noise bed, 25–140 Hz, swelling over ~0.6 s); then hundreds of fragments fall and strike each other and the ground.

Body

each fragment is a short contact burst into a damped stone mode set (modalPreset 'stone'); large blocks ring low (150–500 Hz, 60–200 ms) with a sub thump near 45–80 Hz, small stones and pebbles ring high (1.5–6 kHz, 10–40 ms). Dust and gravel add a diffuse 2–6 kHz hiss from sparse clicks.

Envelope

rumble swells in 0.6 s, holds through the main fall (~0.6–2 s) and dies by ~3.8 s. Hit rate starts after the rumble has built, ramps to ~70/s, then thins exponentially, so the tail is isolated pebbles under a smooth master fade to 4.1 s.

Layers

sub thumps (3 big block landings), rumble bed, dense rock hits (poisson, strength-weighted), pebble scatter (poisson, rate falls late) and gravel grit (crackle, band-passed, decaying).

Variation

`rng` draws size, pitch, pan and strength of every fragment, and the landing times of the big blocks. `density` sets the hit rate, `size` the rubble grain, `rumble` the low-end weight, `grit` the dust and gravel; presets move these to give a brick wall, boulder slide, dry-stone wall and distant fall.

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