[Pharo-project] Adding settings to an existing group

Sorry I haven't really had time to learn the settings framework yet, does anyone know how to do this? Updating the Sound package, I'd like to add a few to the existing category Appearance -> sound (strange place for it, btw...) in a package one can load from the repository. I tried code like: quickStartSoundSettingOn: aBuilder <systemsettings> (aBuilder group: #appearance) with: [ (aBuilder setting: #soundEnabled) with: [ (aBuilder setting: #soundQuickStart) label: 'Play sounds immediately if possible'; target: SoundPlayer; targetSelector: #soundQuickStart]] but that's apparently far off the mark... Cheers, Henry