First
Check if there's a newer version in the fork or the original project:
Why this release
Some display audio devices (if not all) can't be controlled directly with macOS volume options or MultiSoundChanger. BetterDisplay makes this possible.
When controlling the volume of a multi-output device BetterDisplay magic is not applied, so this implementation solves this scenario.
Changes in this version
6a0a889
https://github.com/aonez/MultiSoundChanger/tree/betterDisplay