The machine didn't record continuously, and the extant recordings have been spliced and edited.
The Dictabelts were not guaranteed to record continuously over some period of time, but they would if there was enough traffic, as in the police response to the Tippit shooting. We've been here before.
The splice points have already been identified, and do not affect the 1:16 - 1:19 time period.
As for your continuing assertions that there are edits beyond the splicing, those are simply your own unsupported nebulosities.