Quoted from Rager170:
I noticed something strange last night and cant really figure it out yet.
Once in a while I hear a "clicking" noise that does it about 4 times then stops. I cant figure where its coming from and I dont see any game play being affected. Its not a coil firing as its not that loud but certainly loud enough to be heard clearly. I noticed that it happened when going into the trough and also once after going into the throne room.
I’ve noticed that too, but during multiball I believe. I can hear a repetitive sound like a clicking, or something firing that I can’t identify. It stops after a few seconds. I’ve never figured it out.