It's too bad that the longer audio recordings of Boyd's briefings that exist are stuck in some military or private archive. (I'm not talking about the stuff that's currently available on Youtube.)
Last year someone mentioned an 8 hour recording of Patterns and Conflict that was apparently distributed among some of the participants of Boyd and Beyond 2012. Googling the write-ups of that event should give you more information on which archive the audio recording should be located in (at the Marine Corps museum?).