So here is the flow:
Using my Mac and Chrome (with Transcrib plugin)
1: press Esc to start Mp3
2: press FN twice (this invokes dication to start)
3: let it run for 20sec (watching mp3 time on Cromes Trscriber)
4: after 20sec press Fn once to stop dictation
5: wait till dication is done processing
6: at this point, need to validate dictation processing actually entered new text. Some times it gives up and doesn't do anything.
7: if no new text, use F3 to rewind and try again (step 2)
8: if new text, then instert time stamp of end of 20sec transcription.
9: (remember mp3 has been playing since step 4) use F3 to rewind to new time stamp (step
10: repeat step 2