@brian60221 there may be some sort of controlled situation where you could make eight mathematically similar analog percussive sounds but it wouldn’t be hand claps and the correlation coefficients wouldn’t be 0.99 like this.
But what is going on here isn’t JUST that the waveforms are basically identical:
a) even though the waveforms correlate from shot to shot on each channel, they correlate badly between channels. How is this possible with three microphones within six feet of each other in a same enclosure recording a distant, outside sound source? Try this trick with hand claps and THREE microphones.
b) no other source that we have shows the eight shots having the same signature, and most show drastic differences between the first three and last five–why is the police car the only recording that didn’t observe this?
c) why is the in-car noise missing during the recorded shots? Some have thrown out selective spectral compression as a reason, but this isn’t replicated elsewhere in the tracks, where louder sounds have lower energy noise preserved in the recording. Why would a high-quality recording that is there for use as evidence use a codec that throws away some sounds in an uncontrolled fashion?