Valley Echo Thunder

How it's made

Source

rapid expansion along a branched lightning channel; 2 ms noise attacks and 35–180 ms cracks.

Body

distributed channel arrivals make a 0.38 s pink-noise roar, darkening from 1700 to 230 Hz. Pressure rolls occupy 32–240 Hz, with broad non-tonal swells rather than pitched oscillators.

Space

six alternating wall returns, 0.46–0.78 s apart (158–268 m extra path per return at 343 m/s). Each return loses amplitude and high frequencies; 13–53 ms scattered paths smear the rock reflections.

Envelope

direct crack leads the roar; overlapping reflections ride a rolling bed that fades by 5.9 s. Smooth attacks, subsonic filtering and a final 0.5 s fade prevent discontinuities and residual DC.

Variation

seeded branch delays and independent pressure fields vary the strike without changing geometry. Controls set wall spacing, reflection retention, air absorption, pressure weight and stereo spread.

Presets

tight sheer walls give rapid bright answers; broad walls separate the echoes; distant thunder softens the crack; a deep gorge emphasizes low pressure and persistent dark reflections.

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