This video forensically critiques a nearby machine gun sound that’s heard in the middle of a long volley of shots fired by a distant, higher caliber, machine gun.
My thoughts — I was involved in discussions in the comment section, in which this and more was discussed:
The distant gun’s rate of fire is very consistent, except briefly, at the start. When the high frequency crack sounds appear at 01:00, the *speed increases* and the  *variability is erratic* (some shots are close together, some further apart).
High frequencies fall off quickly over distance, which is why the distant gun report sound has no high frequencies.
The high frequency crack sounds are nearby, supersonic bullets breaking the speed of sound. They could either be incoming bullets from a distant gun or bullets shot nearby from a silenced gun, in which only the crack would be heard.
Since the crack sounds’ rate of fire at 01:00 is faster and erratic, these sounds can’t be from the distant gun, but are likely from a smaller gun that has a faster firing rate, explained in the video.
Also, the crack sounds *suddenly* appear and then disappear — no fade in and fade out, which would happen if bullets were getting closer and then further. A distant gun firing continuously can’t bring in bullets to a location this rapidly without the shots being heard getting closer.
Loudspeaker myth refuted:
Also, many ‘truthers’ still claim that no bullets were fired (and even that nobody died). They say we’re hearing sounds played by loudspeakers. Loudspeakers can’t do this, even if it was surround sound (speakers were probably all up front — not surround).
1) Cameras inside and outside of the venue would not have picked up the same volleys of gunfire from the distant guns.
2) In different videos taken within the venue, gunfire sounds vary significantly in the *high frequency*, supersonic crack sounds, which is impossible to do with a concert sound system. Some videos capture the sound of nearby objects being hit, agreeing with eyewitness testimony.
Related:

(vid) Detailed Machine Gun Sound Analysis – Las Vegas Mass Shooting — 13:25 “That’s guaranteed two shooters, minimum” • 09:55 “If you listen carefully, you’re going to hear BELT FED, automatic weapons going off from two different locations from two different sounds” • 11:07 “The shooter is close. See that high pitched sound? You would not hear that from 500 meters”

(vids) Vegas smaller caliber fire sounds like suppressed UZI 9mm — Compare to unsuppressed UZI and M60 (7.62 chunkier sounds we hear in Vegas videos?)

(vid) Proof that a M240 Machine Gun used in Las Vegas Shooting — “This sounds exactly like the 240 I shot in the infantry. No way is that an AR-15 • “The AR with the bump is too light. The Vegas sound is chunky like the machine gun”

(vid) Mike Adams: Forensic acoustic proof of SECOND, closer shooter in the Las Vegas massacre — Bullets reach target before sound. Lag time tells the range.

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Route 91 – Las Vegas Shooting: An Audio Analysis Updated

Published on Oct 9, 2017

Update 2: Analysis of clip from Las Vegas survivor that shows two guns going off simultaneously. This video examines the rate of fire of the guns, and the sounds heard on the clip. The video was updated because people who don’t understand the physics of sound wanted to claim the other gun was simply an echo. This cannot be an echo nor can it be bullets hitting closer to the camera from the original gun, because the rate of fire is measurably faster than the original gun.