Distant City Traffic

How it's made

Source

hundreds of vehicles several hundred metres away, heard through an apartment window. Individually unresolvable, they fuse into broadband turbulence: engine and road rumble plus tyre hiss.

Body

distance and glass act as a low-pass. Rumble sits at 30–120 Hz, engines at 120–600 Hz, tyre hiss is a faint 1.2–3.5 kHz band that air absorption keeps far below the rest.

Layers

a pink wash (decorrelated L/R), a brown low rumble, an engine band whose centre drifts slowly, and a very quiet tyre-hiss band.

Modulation

passing groups of vehicles (traffic-light cycles) swell the wash by a few dB over 4–15 s through smoothed random drift; level stays steady overall, with no strong periodicity.

Events

an occasional distant horn, two close notes (about a major third apart, 300–520 Hz root) from band-limited saw waves, low-passed below 1.4 kHz so it is muffled, 0.25–0.9 s long with soft 40 ms attack.

Variation

`rng` picks horn pitch, length, strength and pan; macros set density, distance and horn rate.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.