Critical Alert

An urgent, insistent triple beep of a harsh square tone, repeated to signal a critical system problem

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0.00 / 1.66 sMP3 preview · Two-tone siren

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 7PZA9HCYA9@1 --preset siren -o critical-alert.wav

Source: a piezo or small-speaker alarm driven by a square wave. The driver is a band-limited square plus a narrow pulse detuned by 0.4 %, so the two beat slowly and the tone sounds rough and insistent.
Body: a 2.4 kHz class horn resonance (peak, Q ≈ 2) emphasises the harsh upper harmonics of the square; a low-pass at 7 kHz removes the brittle top, and a short broadband tick marks each switch-on.
Envelope: each beep is gated with a 4 ms attack and 6 ms release (no clicks), 130 ms long, 70 ms apart; three beeps form a group, and two groups are separated by a 350 ms pause (≈ 1.45 s in total).
Variation: `rng` detunes each beep by ±0.3 % and jitters its level slightly; macro parameters set pitch, beep length, harshness (pulse width, drive and resonance) and the number of beeps per group.
Modulation: an optional alternate pitch makes every second beep a fixed ratio higher, giving a two-tone warble in the siren preset.

Parameters
Parameter	Range	Default	Unit	Controls
pitch	900 – 3600	2200	Hz	Pitch
beepLength	0.06 – 0.25	0.13	s	Beep length
beeps	1 – 5	3	—	Beeps per group
groups	1 – 3	2	—	Groups
harshness	0 – 1	0.6	—	Harshness
alternate	1 – 1.5	1	—	Alternate pitch ratio
gap	0.03 – 0.2	0.07	s	Gap between beeps
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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