I'm on Ubuntu 20.04, and I want to normalise a lot of MP3 files recursively (i.e. including all subfolders from a main folder); the new replay level should be applicable across the entire collection, if possible; NOT album by album or folder by folder.
And I want the actual files to be updated, so I can play them on a primitive hardware MP3 player in a car, which probably won't be able to recognise replaygain tags.
The only information I've found so far is pretty old; I understand that MP3gain forked to rgain, and there are recommendations to use python replaygain, which may use the same technology. I know MP3gain normalised on the basis of perceived volume, rather than peak volume, and this is exactly what I still want.
It would be great if whatever I use has a GUI; not a deal breaker though. Failing a GUI, some sort of manual, or at least a decent README would be helpful.
So which is the most recent/best package that matches the above requirements?
Cheers
John M.