I’d like to configure Audacity so that it plays a sound when it’s recording.
Then use the Transport menu to set Software Playthrough to be “on”
See this page in the Manual: http://manual.audacityteam.org/o/man/transport_menu.html
Alternatively it can be set in Preferences>Recording
See: http://manual.audacityteam.org/o/man/recording_preferences.html
WC