Koyomado built-in notification sounds
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License: Creative Commons Zero v1.0 Universal (CC0 1.0)
https://creativecommons.org/publicdomain/zero/1.0/

1. gentle-chimes.ogg / deep-drop.ogg / small-bell.ogg
   Source: UI Sound Effects (Button Clicks, User Feedback, Notifications)
   Author: Robin Lamb
   https://opengameart.org/content/ui-sound-effects-button-clicks-user-feedback-notifications
   The source collection is based on public-domain VCSL and VSCO 2 CE samples.

2. gentle-piano.ogg
   Source: A Simple Trifle (ASimpleTrifle.ogg)
   Author: jestar
   https://opengameart.org/content/a-simple-trifle
   Koyomado edit: 10.5 second excerpt, loudness adjustment, fade-in and fade-out.

3. quiet-kalimba.ogg
   Source: Short kalimba loop (Kalimba.ogg)
   Author: extenz
   https://opengameart.org/content/short-kalimba-loop
   Koyomado edit: 10.5 second excerpt, loudness adjustment, fade-in and fade-out.

All listed source pages declared the corresponding files CC0 when retrieved on
2026-08-23. Attribution is not required by CC0, but this notice is included to
make the origin and editing history clear.
