Thank you all for your input. Let me know what you think about how these figures may or may not relate to the knocking sound:
#1 140 #3 135 #5 145 #7 145
#2 155 #4 130 #6 140 #8 140
#1 140 #3 135 #5 145 #7 145
#2 155 #4 130 #6 140 #8 140
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