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Adding a user to a group can be done with usermod in combination with -G or -g or...
Like this


Easy to forget that stuff (did the groupname orthe username come first and was it a capial G or a g...) so I tend to add myself to new groups by simply editing /etc/group

There all the groups are nicely listed and I put my name behind the one I need to be a part of.
before:

after:


The next time you log in you are the proud member of the audio group too
To check it simply type groups in a terminal

This works in Debian Mageia Manjaro etc...
Maybe it is Berserk style but it is way faster than finding it in "control centers" and to get that usermod command right.

Or maybe it is just a habit... It works though