I'm going to try and provide some perspective to the audio analysis videos which have been provide in this thread. Hopefully it will help people understand what is being presented in the analysis?
Here is a video of a bumpstock equipped ar15 semi auto firing listen to its shot cadence and the noise of the action....[www.youtube.com]
Here is another video of a bump stock firing semi auto ar15. Again listen to its shot cadence. Its smooth, rythmic and faster shooting than without the bump stock. ( illustrated in the last two videos) It doesn't speed up or slow down....[www.youtube.com]
Now here is a video of an ar-15 semi auto being fired without the bump stock. For non gun people semi auto means the trigger has to be pulled for each shot......[www.youtube.com]
Here is another one ( notice the breaks in the shooting where he doesn't pull the trigger )....[www.youtube.com]
Now go back and listen to the audio analysis again armed with this information and hear the different shot cadences happening at the same time.