I've listened to the first 2 disks, too. It is fascinating, but I was starting to wonder how many times I will really listen to it. Reading the liners is helping a lot, and will definitely make me go back and listen multiple times.
Interesting the comments about listening with headphones (my thought, too). The very last line of the liner notes says: "For best results - and in order to get the most out of the studio dialogue - we suggest listening to this set on headphones".
There's also this on the CD3 track page: Transcriptions of studio dialogue for all songs available at: http://plosin.com/milesAhead/Disco.aspx?id=BootlegFJD