The incident call, written down
Record the call, then search the transcript when you write the postmortem.
View on GitHub
The timestamps tell you what was said when.
Every line of the transcript carries the time it was said, counted from the start of the recording. Read down the timestamps and you have the order of events for your postmortem.
Good questions.
No. They count from the start of the recording, so 00:11:20 is eleven minutes and twenty seconds in. Note the clock time when you press New recording and you can turn any timestamp into a time of day.
No. The notes summarize what was said and can include a decision when the call made one. The postmortem is yours to write, and the timestamps are what you write it from.