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Have you ever been to one of them Christmas automaton character displays?
I remember the first time I walked through the whole experience was thrown out of whack due to the deafening wringing of actuators and linear motors.
Some of the larger pieces used hydraulics and they Pop when they release the pressure.
I was stuck in the tunnel at Disney Pirate of adventure one time during our family vacation and noticed the same thing. When the Singing would pause timed to start up again when the next boat floats by.

IT would be hard to bust a nut to all of that noise.