Rusty Hinge Squeal

How it's made

Source

dry hinge pin friction alternates sticking and slipping; a 420-1250 Hz wavering tone carries weak second/third harmonics and an inharmonic contact mode at 1.43 times the slip frequency.

Body

gate and hinge leaves resonate at 185, 473, 917 and 1681 Hz with 70-180 ms damping; continuous filtered friction and tiny 5-25 ms rust-grain scrapes excite these modes.

Envelope

a 25 ms load-up leads into a broad swing, two pressure dips and a slowing final scrape; travel lasts 1.35-2.35 s, with a 120 ms damped release and a silent safety tail.

Modulation

slip rate falls from 31 to 9 Hz; irregular drift changes pitch and contact pressure. Binding deepens the chatter and pressure dips; higher modes weaken as the gate stops.

Variation

seeded tuning, chatter phase and granular timings vary independently. Pitch sets hinge scale, rust sets grinding balance, binding sets seizure depth, and travel sets swing duration.

Presets

heavy gate is low and slow; light gate is brief and high; seized hinge breaks into pulses; worn hinge emphasizes coarse grinding. All variants are dry and centered for placement in a scene.

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