Gamma Shield sound sources (Pixabay Content License):
Force field hum - PWLPL
https://pixabay.com/sound-effects/film-special-effects-force-field-hum-377269/
Shield recharging - Bychop (Freesound), via freesound_community
https://pixabay.com/sound-effects/film-special-effects-shield-recharging-107016/
https://pixabay.com/service/license-summary/
Adaptations: mono conversion, trimming, fades, tempo and level adjustment; short impact derived from recharge.
