I don't know how many shots, exactly, the 911 tapes reflect. I'm guessing 20 or fewer, by the time the audio is enhanced. So, after the "first" 911 call, only 20 or so more shots were fired.

That would mean that zero people were calling 911 during the first 130 shots.

Except, of course, I believe they WERE calling 911. But according to the official story, we are to believe that absolutely nothing happened until just before 9:35 a.m.