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@Brun
The first sound on the video is the aftermath of the first burst. The muzzle sound from that arrives about five seconds in. Then there's the second burst at 0:24, and the sound about six seconds later.
Apparently if you're lucky enough to be between the aircraft and target, you're also treated to the sound of the supersonic shockwave as the 30mm rounds pass over your head. I'd imagine that's quite something.