Wall Scratching

How it's made

Source

rough points dragged along the far face of plaster; filtered noise supplies friction, with 90-240 grain contacts/s supplying irregular stick-slip texture rather than a pitched oscillator.

Body

transmitted pressure excites broad wall-panel bands at 155, 340 and 630 Hz (Q 1.5-3.2). Two low-pass stages at 650-2600 Hz remove exposed surface hiss, modelling an intervening wall.

Envelope

2-5 strokes form each burst; strokes last 0.12-1.15 s with 12-35 ms attacks and soft releases. Bursts are separated by 0.7-3.8 s of silence; there is no continuous noise bed.

Movement

each drag darkens as pressure relaxes; random 16 Hz pressure wander roughens its level, while a quieter 180-550 Hz rubbing layer follows the same contact envelope.

Variation

seeded timing, force, grain density and narrow stereo placement vary per stroke. Activity sets pauses and cluster size; drag sets stroke length; depth sets transmission loss; cavity sets panel coupling. Presets cover distant ticks, frantic claws, slow drags and hollow walls.

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