Summoning Circle

How it's made

Source

a ritual circle charging with power. A sustained sub drone (two slightly detuned sine pairs at the root plus a soft triangle an octave up) is the "ground"; a stack of upper harmonics is the energy rising; band-passed pink noise circling the listener is the swirling air/energy around the circle.

Body

the root sits at 41-73 Hz (default ~55 Hz). Harmonics 3..10 of the root are single sines that fade in one after another across the render, each with a slow independent shimmer, so the spectrum climbs from low to ~1.5 kHz. The drone is pulsed by a slow throb whose rate grows from about 0.6 Hz to 2.4 Hz.

Envelope

the whole piece is a crescendo: level, brightness, pulse depth and swirl speed all follow one build curve (slow start, power-law rise) and settle on a plateau for the last 20 % of the length.

Modulation

two band-pass noise channels sweep 300-2200 Hz with opposite-phase sine LFOs (0.15 to 0.5 Hz), which makes the noise orbit between left and right; a drift on the root adds a few cents of instability.

Variation

`rng` sets the shimmer phases and the noise paths; presets change root pitch, pulse speed, harmonic reach and noise amount (dark vigil, ascending halo, storm vortex, near silence).

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