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It could also be the earpiece/speaker turning on and having static noise right before the notification sound is made.

The easiest way to experience this is to plug in headphones and hear the clicking before/after a sound is made.




The sound is loudest if I hold it up to my ear right behind where the SoC is. It generates a unique pattern of sound based on activity, such as running your finger over the touch screen. It's not just when sound events are about to play.




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