I can understand your outright rejection of my suggestion if you think that it is necessary to apply "noise reduction and voice analysis" to the mic. output. (I think the s/n ratio will take care of that)
And I might even understand why you don't think the mic. would not respond to a "fast" drip in an "accurate" manner. (limited frequency response?
)
But I do understand that you probably never have heard a mic. being hit by a raindrop (or anything else) and checked the signal on an oscilloscope.
And now i understand why you posted the in the first place.