Arcane Portal

How it's made

Source

a held magical vortex heard as three layers: a detuned bowed-saw drone on a root and its fifth, a band-passed noise swirl (air pulled through the ring), and sparse glass-like sparkles shed by the rim.

Body

the drone passes a resonant low-pass (Q ≈ 3–7) whose cutoff circles between ~0.6 and ~3 kHz; the noise swirl sits in a Q ≈ 6–10 band-pass that sweeps opposite in the left and right channels, so the resonance appears to orbit the listener. A sub sine an octave under the root anchors the low end.

Envelope

sustained. Slow phasing comes from left/right oscillator pairs detuned by 0.1–0.4 %, which beat at roughly 0.1–0.6 Hz; swirl LFOs run at whole cycles per loop so the loop closes cleanly.

Events

glitter is a Poisson stream (2–22 per second) of 3 ms-attack sine pairs on a harmonic series of the root (16th–40th partial), 80–400 ms exponential decay, random pan and strength.

Variation

`rng` picks the sparkle pitches, timing, pan and oscillator phases; presets change swirl speed and depth, brightness, glitter density and root pitch (a calm shimmer, a stormy gate, a deep abyss, stardust).

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