This metronome app was created for a musician and music teacher, Avi Bortnick. The idea was to have a precise metronome app that would, randomly, skip some beats – in order for the player to improve his own, internal, rhythm sense.
So the app sounds like:
beat - beat - - beat - - - beat - ... (etc)
The real deal here was to generate the beats sounds at the very moments they should be played. A 1/50th of a second delay was not acceptable by the client
You can check this app here: https://itunes.apple.com/pl/app/time-guru-metronome/id421929034?mt=8