Vehiclesone-shot · 3.05 s
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Distant Train Horn Chord
A sustained five-tone locomotive air horn softened by distance, with fading hillside reflections.
one-shot · 3.22 s · 0 downloads · 0 likes
0.00 / 3.22 sLow freight call
Tweak
renders in the CLI · WAVChange parameters to build an exact command. Your agent runs it with sb and gets the WAV.
$ sb get 4M8SGZA790@1 --preset freight -o distant-train-horn-chord.wav
How it's made
- Source
- compressed air drives five horn diaphragms; seven additive harmonics per horn model the buzz. Filtered pink turbulence adds breath below the pitched body, without a valve click at this distance.
- Body
- fundamentals at 1, 1.189, 1.498, 1.782 and 2 times 247 Hz form an uneven locomotive chord. Strong second and third harmonics give brass projection; air absorption rolls off above 1.3–3.2 kHz.
- Envelope
- pressure builds over 130–210 ms, sustains for 0.85–1.65 s, then releases over 240 ms. Each diaphragm speaks a few milliseconds apart; pitch settles upward by 0.9% as pressure builds.
- Modulation
- common slow pressure wander and independent 0.2% pitch drift keep the chord alive.
- Space
- a compact direct image, offset hillside reflections at 130/210 ms and a four-delay diffuse reverb. The last 0.6 s progressively fades the remaining reflections to silence within 3.3 s.
- Variation
- seeded tuning offsets of 0.15% and starting phases; presets vary register, blast length, air absorption and reflected energy for freight, valley, short warning and night-distance uses.
| Parameter | Range | Default | Unit | Controls |
|---|---|---|---|---|
| pitch | 195 – 300 | 247 | Hz | Lowest horn |
| sustain | 0.85 – 1.65 | 1.45 | s | Blast sustain |
| distance | 0 – 1 | 0.65 | — | Distance |
| echo | 0 – 1 | 0.5 | — | Landscape reflections |
| seed | int | 1 | — | Variation, reproducible |
The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.
Revision history1
- r12026-10-25engine 1.0.1use('4M8SGZA790@1')