Thanks Sean, this was my first exposure to Mike's sound analysis. Most interesting and well done.
There is one possible explanation that would still allow for one shooter however, in my view. Rather than changing magazines during the pauses, the shooter may have been changing weapons. For instance a long burst from an AK47 followed by another from an M16 would produce different ballistic results and hence, sound patterns. This is common and may even been required, as very few rifles could be used to fire 1000's of rounds without experiencing mechanical issues from heat etc., unless designed with belt feeding and multiple barrels.
The narrative from the start, has included a variety of weapons at the shooters disposal. Having said that, I am unclear as to whether the sound patterns analyzed were on top of each other (simultaneously fired), which would indicate without a doubt, two weapons being fired, very difficult to perform accurately by a human without automated assistance.
Google AR-15 meltdown, the gun if it is a high end gun can fire thousands of rounds before a mechanical breakdown. I do not believe there was an AK-47 in the arsenal of the shooter's, I believe they were AR-15, and possibly an AR-10. I also believe the HealthRanger's acoustic sound analysis, hopefully he will do one on the JFK assassination as well. The scars part is that the FBI has these capabilities as well, and they have not deployed them, the question that needs to be asked is why not?
ahand & friends: Wow - thank you ALL so much for your support. I so very much appreciate the input, info & feedback!!!
~Sean