Seed #6031 is one entry in the Sleep & Lullabies pillar of Calm Sound Archive. It is generated in the browser with the Web Audio API, so nothing is streamed and nothing is downloaded: the same seed number always produces the same piece of audio.
What you are hearing
Brown noise through a low lowpass filter, which removes the hiss and leaves a dense, even rumble.
The musical material uses Japanese Hirajoshi at 51 BPM, tuned to 396 Hz. A binaural offset of 5.4 Hz separates the left and right channels slightly, which is what gives the track its width on headphones.
When to use it
Use it at low volume as you fall asleep. The eight-hour timer exists for exactly this. This seed leans toward deep sleep and runs at 51 BPM, so it moves slowly enough to sit under conversation or sleep.
Technical parameters
| Seed | #6031 |
|---|---|
| Pillar | Sleep & Lullabies |
| Instrument | Warm Cello |
| Layer | Astral Cloud |
| Engine | Deep Brown Noise Cocoon |
| Scale | Japanese Hirajoshi |
| Tempo | 51 BPM |
| Tuning | 396 Hz |
| Binaural offset | 5.4 Hz |
| Filter ceiling | 284 Hz |
How to listen
- Press play and choose a session length between five minutes and eight hours.
- Headphones give the binaural layer room to work; speakers still play the track but flatten the stereo image.
- Keep the volume where you can still hear the room. The fade-out at the end of a session is ten seconds, not a hard stop.
How this seed differs
Seeds in the Sleep & Lullabies pillar share an engine family, but the parameters are not interchangeable. Here the filter ceiling sits at 284 Hz and the binaural offset at 5.4 Hz. For comparison, seed #6030 cuts at 1346 Hz, this one at 284 Hz; seed #6032 runs at 51 BPM, slower than the 51 BPM here.
The tuning is 396 Hz, which shifts the whole scale away from the more common 432 Hz reference. At 51 BPM the phrase repeats roughly every 4.7 seconds, so the loop is long enough that it does not feel like a short sample on repeat.
When this one works best
Lights out, volume low, timer set to eight hours. Start it before you lie down so the fade-out happens while you are already asleep.
The mood tag for this seed is Deep Sleep. Treat it as a starting point rather than a rule: the same track can sit under a work session at low volume and under sleep at an even lower one.
Questions about #6031
Does this seed download any audio?
No. The track is synthesised in the browser when you press play. Nothing is streamed, and there is no MP3 file behind it, which is why the same seed number always sounds the same on any device.
Can I leave it running for eight hours?
Yes. The timer goes up to eight hours and fades out over the last ten seconds instead of cutting abruptly. If you only need a short reset, the five-minute default is already selected.
Why does it sound different from the neighbouring seeds?
Because the engine reads the seed number to set the filter, the tuning, the tempo and the stereo offset. Small changes in those values change the texture more than a change of instrument would.