# Engine audio credits

## ford-idle.wav
Derived from **Starting of Ford V8 5 Liter engine** by **noiseloop**.
Source: https://freesound.org/people/noiseloop/sounds/455925/
License: **Creative Commons Attribution 3.0** — https://creativecommons.org/licenses/by/3.0/
Changes: excerpt 2.50–5.40 s of the public HQ preview, mono conversion, DC removal,
level adjustment, loop crossfade; pitch/EQ varied during gameplay.
This is a recording of a Ford 5-litre V8, not a verified recording of each historical Bronco® engine.

## v8-pull.wav
Derived from **v8 engine rev.wav** by **overmedium**.
Source: https://freesound.org/people/overmedium/sounds/651534/
License: **CC0 1.0** — https://creativecommons.org/publicdomain/zero/1.0/
Changes: excerpt 2.45–3.85 s of the public HQ preview, mono conversion, DC removal,
level adjustment, loop crossfade; pitch/EQ varied during gameplay. Exact vehicle unknown.

## v8-overrun.wav
Derived from **Rover-v8-rr79.ogg** by **Collard** (English Wikipedia).
Source: https://commons.wikimedia.org/wiki/File:Rover-v8-rr79.ogg
License: **Public domain**, released worldwide by the author.
Changes: excerpt 11.50–13.50 s, mono conversion, DC removal, level adjustment,
loop crossfade; pitch/EQ varied during gameplay.

The sound engine layers recordings with procedural combustion. V8 profiles use the
recorded V8 timbre; I6 profiles use six-cylinder pulse timing with a reduced,
repitched recorded texture. Those are approximate resynthesized I6 profiles,
not original recordings of a Ford 170/200/300. No claim is made that this is a
factory acoustic measurement of every engine, exhaust or model year.

During playback these edited recordings are further processed into short,
phase-matched sustained engine-cycle loops, with DC correction and normalized
level. Playback rate follows the simulated engine RPM. This removes the
original recordings’ own repeated rev sweeps; load controls the pull/overrun
mix, filtering and bass. No additional recordings have been introduced.