Quoted from desertT1:● The return of “The Knocker”
This is one of the best parts. Seriously, the Stern speaker beep is the worst sound in pinball. While it signifies good results, the way it does it is terrible. The smacking echo is pretty much the best sound in the game.
It almost seems as theyre going for the whole "Knocker" pun - so maybe theres more to it?