I found the tool.
I applied the hum tool after the first second. Turn the volume up and listen to the section just before “Prolog.”
The buzz drifts into a nice quiet rain in the trees hisssss.
I need to drop out for a while.
I’m going to attack your raw sample and see what I can do there.
This is where I got the tool from.
http://forum.audacityteam.org/download/file.php?id=16075
https://forum.audacityteam.org/t/removing-really-bad-hum/43406/3
Koz