Tension Riser

Rising noise and detuned tone building to an abrupt stop; a tension build before a reveal or drop

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Preset

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Free for commercial use. No attribution needed.

Tweak

renders in the CLI · WAV

Change parameters to build an exact command. Your agent runs it with sb and gets the WAV.

Command

$ sb get HR94Y1FQ9D@1 --preset short -o tension-riser.wav

Source: a tension riser is two cooperating sources: turbulent air (pink noise) and a stack of detuned sawtooth voices whose pitch climbs two octaves, the way a synth pad or string section swells.
Body: the noise passes a band-pass (Q ≈ 1.5) whose centre rises exponentially from 300 Hz towards the top frequency; the saws pass a low-pass that opens from 500 Hz upwards so harmonics appear as it climbs; a quiet sine sub an octave below follows the same pitch curve for weight.
Envelope: a convex crescendo (exponent ≈ 2.5) from near silence to full level at the end; an amplitude flutter accelerates from 3 Hz to 18 Hz and deepens with the pulse parameter, adding urgency.
Ending: the reveal cue is an abrupt stop, so the level holds to the end and is cut with a 12 ms fade to avoid a click, leaving space for whatever hits next.
Variation: `rng` shifts the detune of each saw by a few cents and decorrelates the left and right noise. Presets change length, tone/noise balance, pitch range and pulse.

Parameters
Parameter	Range	Default	Unit	Controls
length	1 – 6	3	s	Length
tone	0 – 1	0.5	—	Balance of pitched layer against noise
brightness	0 – 1	0.6	—	Brightness
pulse	0 – 1	0.3	—	Depth of the accelerating flutter
pitch	55 – 220	110	Hz	Start pitch
seed	int	1	—	Variation, reproducible

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

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