# Generative Ambient — Randomly

> A mood preset that evolves and never repeats. One of 63 generators at [Randomly](https://randomly.cluxnei.dev), a library of random generators seeded from verifiable real-world entropy. Free HTTP API, no key, no signup.

## `audio.ambient` — Generative Ambient

A mood preset that evolves and never repeats.

| | |
|---|---|
| **Key** | `audio.ambient` |
| **Module** | `audio` |
| **Version** | `1` — a permalink carries this, and a replay against a different version returns `409` rather than something else |
| **Formats** | `application/json`, `text/plain`, `audio/wav` |
| **Studio** | https://randomly.cluxnei.dev/g/audio/ambient |
| **API** | `GET https://randomly.cluxnei.dev/api/v1/g/audio.ambient` |

`value` is a **score** — events, envelopes and synthesis parameters — not samples. Ask for `format=wav` to get the audio.

| Parameter | Type | Default | Accepts | What it does |
|---|---|---|---|---|
| `mood` | enum | `glacier` | `glacier`, `dusk`, `rainfall`, `orbit` | Mood |
| `root` | enum | `D` | `C`, `C#`, `D`, `D#`, `E`, `F`, `F#`, `G`, `G#`, `A`, `A#`, `B` | Root |
| `duration` | float | `60` | `20` – `150` | Length (seconds) — Bounded on purpose: the browser renders every sample before it plays anything. Loop it and the fades hide the seam. |
| `density` | float | `14` | `0` – `60` | Notes per minute — How often a single note falls over the pads. Zero leaves the chords and the floor alone, which is the version to work to. |
| `bed` | float | `1` | `0` – `2` | Floor — Scales the noise layer. Past 1 the piece becomes weather with chords in it rather than the other way round. |
| `spread` | float | `0.7` | `0` – `1` | Stereo spread |
| `movement` | float | `0.5` | `0` – `1` | Movement — How far the filter over the floor drifts across the piece. It is most of what makes the thing sound alive rather than held. |
| `volume` | float | `-12` | `-36` – `0` | Volume (dBFS) — Where the mix sits before the master limiter. 0 dBFS is full scale; everything starts 12 dB below it. |

Out-of-range numbers are **clamped, not rejected**, so a request never fails for being
ambitious — but it may not do what you meant. Unknown keys are dropped and missing ones
fall back to the defaults above.

```bash
curl -s 'https://randomly.cluxnei.dev/api/v1/g/audio.ambient?mood=glacier&root=D&duration=60' -H 'Accept: text/plain'
curl -o out.wav 'https://randomly.cluxnei.dev/api/v1/g/audio.ambient?mood=glacier&root=D&duration=60&format=wav'
```

## The receipt

Every result carries one, naming the physical source of the randomness and linking to the
third party's own record of it:

```json
"receipt": {
  "source": "seismic",
  "source_label": "USGS Seismic Feed",
  "class": "C",
  "caveat": "Carries only tens of bits of genuine surprise. Always mixed with the OS CSPRNG.",
  "narrative": "A magnitude 3.6 earthquake, 67 km N of Culebra, Puerto Rico, 39.6 km down — 52 minutes ago.",
  "proof_url": "https://earthquake.usgs.gov/earthquakes/eventpage/us7000th33",
  "mixed_with_csprng": true,
  "degraded": false
}
```

Pick the source with `?source=`, or leave it at the default `auto`:

- **Class A** (Cryptographic) — `csprng`, `anu-qrng`, `random-org`
- **Class B** (Public beacon) — `nist-beacon`, `drand`, `bitcoin`. Published openly — anyone can look this value up after the fact.
- **Class C** (Observational) — `seismic`, `space-weather`, `atmosphere`, `iss`. Carries only tens of bits of genuine surprise. Always mixed with the OS CSPRNG.

## More

- [The full API contract](https://randomly.cluxnei.dev/api.md)
- [Everything in one file](https://randomly.cluxnei.dev/llms-full.txt)
- [The catalogue as JSON](https://randomly.cluxnei.dev/api/v1/generators)
- [This generator in the browser](https://randomly.cluxnei.dev/g/audio/ambient)