MY guess would be that the


MY guess would be that the automatic gain control is suppressing the gain to compensate for the loudness of the gun shots. If possible, turn off the auto gain in the audio system, then set the gain on the camera to -40 to -60db while you’re shooting and back up to -12db when you’re talking. When taping musical events we’ve found that rim-shots on the drum will have the same effect that you’re encountering if we have the audio set to “auto.” As a matter of good practice when taping, for better control it’s best to have the audio in the manual mode at all times.
Another approach would be to kill the live gunshot audio entirely, record the shots in isolation at an appropriate level and add them to the project in post. This would give you the greatest control.

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