NEW AUDIO DATA. UPDATED analysis. I am pulling back on the estimated distance of shooters for rounds 6 and 7, and adding two additional rounds discovered in multiple audio files. We now have 10 rounds total, with #10 believed to be Secret Service, and #9 believed to be PA LEO. Special thanks to @ChrisMartenson for sharing additional audio. I found that one of the "snaps" from the Fox broadcast was actually a rifle report which had apparently been gated by the mic, making it sound like a snap, but other audio files clearly designate it as a boom (report), so my distance attributions for rounds #6 and #7 have been removed. Here is the current updated chart, which unfortunately doesn't tell us distances of a possible second shooter:

Receiving new audio files from the event thanks to @chrismartenson - I will be revising and updating my audio forensics analysis chart. It's now clear there is another round in the "5-round burst" which I had previously identified as only four rounds. It's now being stated that PA law enforcement fired one round, so this will be incorporated into the next analysis.

NEW HALF-SPEED AUDIO, please offer your analysis: Stacked 3 audio sources of the cluster of what seems to be 5 rounds, these were fired after the original 3 rounds. So these are rounds #4-8, which in this case would indicate #9 (10 seconds later or so) as the counter-sniper round. This audio snippet stacks the Fox News feed, a "ROOF" audio file (thanks to @chrismartenson ) and a "near building" audio file which was closer to the building on which Crooks was found.