I listened to the audio, total of nine shots with 3 distinct tones. The first three shots were most likely from a 5.56 from the same position, slow paced shots fired, semi auto. The following 5 shots sounded like 7.62, the first three of those were semi auto mode, the following 2 shots were in select fire mode and the reflexes of the shooter was definitely well experienced. ~15 seconds after the first shot was the ninth shot, definitely shot from a different position from the previous two positions, sounds like a 7.62 out in the open, very little echoing, most likely the ss sniper hitting the patsy guy on the roof.