Accelerando — human mouth sound recordings, version 7

All clips retain their performers’ recorded pitch and pace. Edits: continuous excerpts, mono downmix, DC removal, 7 ms edge fades and fixed gain normalization. No generated voices, synthetic engines, layering or added spoken quips. Existing recording effects remain.

V8 Engine, Human Vocal — NoahBangs
https://freesound.org/people/NoahBangs/sounds/616524/
License: CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/

Mouth Revving — ceoux
https://freesound.org/people/ceoux/sounds/338195/
License: CC0 1.0 — https://creativecommons.org/publicdomain/zero/1.0/

Fast Car Passing by — danlucaz (Daniel Lucas)
https://freesound.org/people/danlucaz/sounds/517738/
License: CC0 1.0 — https://creativecommons.org/publicdomain/zero/1.0/

raspberry.wav — Reitanna
https://freesound.org/people/Reitanna/sounds/323710/
License: CC0 1.0 — https://creativecommons.org/publicdomain/zero/1.0/

Sputtering and Coughing Vocal Motor.mp3 — se2001
https://freesound.org/people/se2001/sounds/469616/
License: CC0 1.0 — https://creativecommons.org/publicdomain/zero/1.0/

Cartoon Auto Running — se2001
https://freesound.org/people/se2001/sounds/677714/
License: CC0 1.0 — https://creativecommons.org/publicdomain/zero/1.0/

Required attribution for sports-correct-01.wav through sports-correct-04.wav:
“V8 Engine, Human Vocal” by NoahBangs, via Freesound, licensed CC BY 4.0. Modified: excerpted, downmixed to mono, DC removed, edge faded, gain adjusted.
https://freesound.org/people/NoahBangs/sounds/616524/
https://creativecommons.org/licenses/by/4.0/

Other sources are CC0; credits retained as provenance. New MP3s are Freesound HQ previews; source copies and available page captures are retained in sources/. Exact edits and source hashes are recorded in manifest.json.
Audio adapted from “Williams-Renault FW18 (1996)” by Edvvc (Ed Pond), recorded 3 July 2010 at Goodwood Festival of Speed. Source: https://commons.wikimedia.org/wiki/File:Williams-Renault_FW18_(1996).ogg . Licensed CC BY-SA 3.0: https://creativecommons.org/licenses/by-sa/3.0/ . Changes: trimmed to 3.50–7.35 s, short fades, volume normalization, format conversion. Adapted audio is also licensed CC BY-SA 3.0.