Library Audio

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

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 ISS Position.

seed token 0HAGMD07JV4VGVZ7SYPRYVMMER

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%

entropy in

16 bytes

stream used

56 bytes

rejections

duration

118 µs

colour

Pink

expected slope

-3 dB/octave

duration

10.0 s

samples

441,000

Seed receipt

Class C · Observational

The ISS was over 43.71° S, 158.93° W — 2,350 km south-east of Auckland — when this was drawn.

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

source: ISS Position
observed: 2026-10-28T23:08:28+00:00
latency: 157ms
mixed with: csprng — always

https://www.openstreetmap.org/#map=3/-43.71/-158.93 ↗

Permalink

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.

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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