Startup sound file:
- startup_radio_shortwave_cc0.wav

Generated from source file:
- walkie_talkie_start_cc0_source.wav
- Clip used in app: first audible 1.8 seconds (trimmed for startup cue)

Source:
- BigSoundBank (Walkie talkie: Start)
- https://bigsoundbank.com/walkie-talkie-start-sound-589.html
- Direct file URL: https://bigsoundbank.com/UPLOAD/bwf-en/0589.wav

License:
- CC0 1.0 Universal (public domain dedication)
- No attribution required

Downloaded on:
- 2026-03-01
