Ground Pound

How it's made

Source

a heavy body lands on hard ground. The impulse is a ≈ 3 ms broadband slap that shatters the surface (crack), shoves the ground (sub thump) and throws up debris and dust (hiss tail).

Sub thump

the ground and the air column under the body move as a damped low oscillator; pitch falls from ≈ 85 Hz to ≈ 38 Hz in 0.15 s while it decays over ≈ 0.55 s. A light tanh adds 2nd/3rd harmonics for small speakers.

Crack

stone fractures as a bright band-passed noise burst (1.8–4.3 kHz, ≈ 25 ms) followed by 3–5 small secondary fractures (5–40 ms apart, 2–5.5 kHz, each 8–20 ms); a stone mode bank is the slab ringing 60–200 ms.

Dust hiss

pink noise high-passed at 3–5 kHz, peaking ≈ 80 ms after the hit and fading over ≈ 0.8 s, with a sparse crackle of falling grit that thins out as the debris settles.

Envelope

thump and crack are instantaneous (0.3–1 ms attack); the thump lasts ≈ 0.55 s, the crack ≈ 0.15 s, the hiss tail runs to ≈ 1.1 s. The whole sound is closed by a fade to silence at about 1.2 s.

Variation

`rng` jitters fracture timing, mode tuning and grit; `weight` sets thump pitch and depth, `crack` the fracture level, `dust` the tail level and length, `hardness` the brightness of slab, crack and hiss.

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