To filter sources and destinations by name, type the name (or the first few letters of the name) into the relevant ‘Search’ field. To clear the filtering, delete the text from the search field. To show or hide a source or destination group, click the arrow ► for that group. To hide an individual source or destination, right-click the source or destination and select ‘Hide’. To reveal hidden sources and destinations, from the general tab of the Preferences menu, select ‘Show hidden audio devices’.