https://www.youtube.com/watch?v=TIWRbR69Cjc

Note

1. This is not for changing volume normalization.

2. See https://github.com/cyfung1031/userscript-supports/issues/47

3. For Volume Change, see

   1. https://greasyfork.org/en/scripts/404756-youtube-volume-curve-designer
   2. https://greasyfork.org/en/scripts/466775-youtube-volume-assistant