Butler audio is unarguably definitive that there were multiple shooters. Delay-echo patterns in the recordings (at each location) contain unique fingerprints of each shooter.
Anon disagrees with video assumption, and asserts first three shots likely from a professional. Patsy screwed things up by taking forever to get into position, and was likely instructed to wait for initial shots to be fired.
Audio from first three shots is a filtered sound with little echo suggesting an enclosed or partially enclosed location.