Seismic Slam audio: Hard Heavy Impact by DRAGON-STUDIO, Pixabay.
https://pixabay.com/sound-effects/film-special-effects-hard-heavy-impact-515256/
License: Pixabay Content License
https://pixabay.com/service/license-summary/
Adapted for synchronized game impacts: trimmed attack and tail, mono conversion,
three subtle pitch variants, low-pass filtering and a quiet low-frequency tail.
No synthetic oscillators or electrical layers are used.
