I agree, a bad switch, the decorator switches seem to make this noise if they are turned on or off slowly. When the light is on, make sure you have the correct circuit breaker OFF, then remove the old switch and install the new one. I always use the screws and not the holes for inserting the wires, had a bad experience with these.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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