In addition to the visual redesign, however, macOS Big Sur completely overhauls the sound effects.
A pair of new videos on YouTube from channel Pomamitia offer a detailed walkthrough of the new system and alert sounds in macOS 11 Big Sur, compared side-by-side with the sound effects from macOS 10.15 Catalina. Some of the changes are more subtle, while others are completely new.
Previously:
- Visual Comparison of macOS Catalina and Big Sur
- macOS 11.0 Big Sur Announced
- Jim Reekes Discusses Apple Sound History
Update (2020-07-23): See also: Upgrade.