Noise Colours

White, pink, brown, blue, violet — and perceptually flat grey.

audio.noise · v1 · renderer audio

0:00 / 0:00

Pink noise · -3 dB/octave · 10.0 s · looping

Equal energy per octave. The one most people call “natural”: rain, surf, a busy room.

[data-audio-stage] { display: none; }

Synthesised in the browser

No audio file crosses the wire. The server sends a score — the events, envelopes and synthesis parameters below, plus a 32-byte key — and the samples are made here, from the same byte stream the server would have used. A four-minute piece is about two kilobytes of JSON. That needs JavaScript, so with it switched off there is nothing to play.

The score itself is still public: /api/v1/g/audio.noise returns it, and the synthesis is in resources/js/audio.

Pink noise · -3 dB/octave · 10.0 s · looping

entropy in

16 bytes

stream used

56 bytes

rejections

duration

79 µs

colour

Pink

expected slope

-3 dB/octave

duration

10.0 s

samples

441,000

Seed receipt

Class C · Observational cached

It was 6.9°C in Nuuk, Greenland, with a 8 km/h wind, when this was made.

Carries only tens of bits of genuine surprise. Always mixed with the OS CSPRNG.

source: Live Weather
observed: 2026-09-13T18:45:11+00:00
latency: 0ms
mixed with: csprng — always

https://open-meteo.com/en/docs#latitude=64.181&longitude=-51.694 ↗

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The token is the seed, so this link recomputes the result rather than looking it up. No database, and it works for as long as v1 does.

Controls · from schema()

Colour

A colour is a spectral slope. The measured slope is printed under the waveform.

Length (seconds)

2 30

Kept short on purpose — with Loop on, the buffer is crossfaded into itself and plays forever.

Loop

Seamless: the tail is crossfaded onto the head, so there is no click at the seam.

Filter

Cutoff (Hz)

60 16000

Resonance (Q)

0.4 8

Above about 4 the filter starts to ring, which turns noise into a pitch.

Movement

0 1

How far the cutoff drifts over the loop. A little of this is the difference between a hiss and something that sounds like weather.

Volume (dBFS)

-36 0

Where the mix sits before the master limiter. 0 dBFS is full scale; everything starts 12 dB below it.

Entropy source

Picking a source changes the story on the receipt, never the quality: anything below class A is mixed with the OS CSPRNG before it reaches you. This result actually came from Live Weather.

seed token K18A750DS80Y3CH0D9177A1ZCR

Re-render keeps this token. Generate replaces it. That is the whole idea.

The file is the render, sample for sample — not a second performance of it. The seed below reproduces it anywhere.

monitor

80%

This page and /api/v1/g/audio.noise run the same code. There is no private endpoint.

Noise Colours

Result

Measurements

Seed receipt

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