There are a few audio fade in and outs throughout both discs, something like wavey sections like the good old days of tapes.

According to the taper, he "used automatic level setting to record the show and there are a few level changes - 3 or 4 - that are in the master."
 
Here's my take on this - the wave-effect makes me feel seasick. I swear to God, I kid you not.