Comment 12 for bug 1738676

With 18.04 LTS, if you login with flashback, the volume slider in the sound settings as well as the volume slider that drops down when clicking the speaker indicator behave backwards even when natural scrolling is off.

With flashback, turning natural scrolling on actually makes both volume sliders behave as you would expect (up=up, down=down). Using "natural scrolling" is too unnatural to keep this setting however.