Keyclick is a Mac OS X preference pane that provides subtle audio feedback for each keystroke the system recognizes. Years ago keyboards were made with premium key switches that provided a resounding click when a key snapped over. Today most keyboards are made using rubber domes which can provide a similar force displacement or tactile feel, but not the sound. Human factors work on video terminals in the 1980s showed that the perception of keyboard crispness is correlated with audio feedback. Keyclick provides that feedback while improving on the original.