Seed #1501 is one entry in the Instruments 1-by-1 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
A struck bowl: a fundamental sine plus inharmonic partials at roughly 2.75x and 5.4x, each decaying at a different rate.
The musical material uses F Lydian at 65 BPM, tuned to 432 Hz. A binaural offset of 2.2 Hz separates the left and right channels slightly, which is what gives the track its width on headphones.
When to use it
Use it when you want a single instrument and nothing else — no bed of noise, no percussion, no vocals. This seed leans toward cozy reading and runs at 65 BPM, so it moves slowly enough to sit under conversation or sleep.
Technical parameters
| Seed | #1501 |
|---|---|
| Pillar | Instruments 1-by-1 |
| Instrument | Celtic Harp |
| Layer | Light Breeze |
| Engine | 432Hz Resonance Bowl |
| Scale | F Lydian |
| Tempo | 65 BPM |
| Tuning | 432 Hz |
| Binaural offset | 2.2 Hz |
| Filter ceiling | 1237 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 Instruments 1-by-1 pillar share an engine family, but the parameters are not interchangeable. Here the filter ceiling sits at 1237 Hz and the binaural offset at 2.2 Hz. For comparison, seed #1500 cuts at 1223 Hz, this one at 1237 Hz; seed #1502 runs at 63 BPM, slower than the 65 BPM here.
The tuning is 432 Hz, the reference pitch this archive uses most often for meditation and sleep material. At 65 BPM the phrase repeats roughly every 3.7 seconds, so the loop is long enough that it does not feel like a short sample on repeat.
When this one works best
When you want one instrument and nothing else, usually during focused work or a short practice session. It is also the pillar that works best on laptop speakers, because there is no low-frequency bed to lose.
The mood tag for this seed is Cozy Reading. 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 #1501
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.