often, when I do experiments, something interesting turns up that I hadn't thought of. I sought today to record Cape Town's noonday gun, together with its rolling echo (my fourth attempt). The recording didn't do as well as expected, but I made this discovery. Using a 2 kHz high-pass filter, when the gun goes off (at 1:47), insects fall silent for seven seconds, and appear to lose their rhythm for thirty seconds, over an area of about ten square miles.
POSTSCRIPT: My interpretation may be incorrect here. How much of this lies in the filter?
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