It would solve the problem if you get a Styrofoam sheet or block and attach it so the rainwater drops on it. Styrofoam has plenty of elastic squishiness and thus deafens the impact sounds a lot. It is also more hydrophobic (makes water bead up and fall of instead of soaking in), and thus it is a solution superior to sponges and pillows (those will soak up water much more easily and potentially create a spawning point for harmful molds).
user165855
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