Melody

Random walk, Markov, or the 1/f kind that sounds written — on a scale that cannot clash.

audio.melody · v1 · renderer audio

0:00 / 0:00

Major pentatonic (can’t sound wrong) on C4 · Bounded random walk (contour) · 24 notes · 8 bars at 100 BPM · FM (bells, electric piano)

A bounded walk: small steps common, occasional leaps. That weight table is the melodic contour rule music theory describes.

[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.melody returns it, and the synthesis is in resources/js/audio.

Major pentatonic (can’t sound wrong) on C4 · Bounded random walk (contour) · 24 notes · 8 bars at 100 BPM · FM (bells, electric piano)

Controls · from schema()

Scale

The one control that decides whether random notes sound musical. Pentatonic has no semitone in it to clash with.

Root

Octave

2 5

Octave 4 is middle C.

Range (octaves)

1 3

Method

Switch between these on the same seed. Uniform is aimless, the walk has contour, Markov has phrasing, 1/f sits where real music sits.

Markov order

1 2

Only used by the Markov method. Order 1 is a word salad of intervals; order 2 starts quoting whole phrases.

Bars

1 16

Tempo (BPM)

50 180

Note length

Rests

0 0.5

How often a note is left out. A melody with no silence in it has no phrases in it.

Engine

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 4G4PQD589R8V6XV4NJDANK8A7G

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

645 bytes

rejections

duration

472 µs

scale

Major pentatonic (can’t sound wrong) on C4

method

Bounded random walk (contour)

notes

pitch span

C4 – C6

duration

19.7 s

Seed receipt

Class C · Observational

The ISS was over 26.74° N, 8.91° E — 2,140 km south-east of Lisbon — when this was drawn.

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

source: ISS Position
observed: 2026-10-28T22:15:11+00:00
latency: 137ms
mixed with: csprng — always

https://www.openstreetmap.org/#map=3/26.74/8.91 ↗

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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.

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

Melody

Result

Measurements

Seed receipt

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