This is a KDE question.

In System Settings / Multimedia / Audio and Video Settings
I would like to remove some old audio devices that are listed and I don't use them anymore.

This is not an extremely important issue in the sense that my system is still usable, but it's inconvenient as it is now, because the same list shows up on other lists and sometimes I am not sure which entry corresponds to which device so it becomes a guessing game.

I would expect that this should be an easy move, but have not been able to figure it out. Thanks for any help!!