Boulder Roll

How it's made

Source

a massive rounded rock rolls over stone joints. Brown and pink contact noise carry continuous 40-240 Hz load vibration; overlapping 15-65 ms friction grains supply the 350-2600 Hz grinding surface.

Body

rounded 9-18 ms impacts excite damped stone modes near 70, 127, 213 and 356 Hz, scaled by mass. Their 90-240 ms decays and low-passed excitation prevent metallic ringing or sharp broadband clicks.

Envelope

load wanders at 0.7-1.8 Hz while micro-contact pressure varies at 6-12 Hz; the friction band moves with that pressure. No startup or stopping gesture interrupts the continuous eight-second loop.

Events

joint contacts occur every 0.32-0.95 s with 38 percent jitter; grain density is 22-60 per second. Seeded strength, colour, duration and small position changes keep successive contacts unequal.

Space

a restrained, dark hall response represents the stone corridor; the direct low end stays central. The engine crossfades into continuing audio at the loop boundary; there is no master fade or silent gap.

Variation

speed controls joint spacing and grain density, mass lowers body bands, grit opens friction, bumps sets unevenness, and corridor controls reflections. Presets cover smooth, rough, giant and fast rolls.

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