If you ignore the audio, and just look at the gaps, there are long ones and short ones. If you consider the long gaps as breaks, and count the short gaps between them, you get the following sequence:
10, 10, 1, 6, 3, 11, 7, 2, 17, 7, 13, 2, 1, 6, 12, 3, 6, 5, 8, 1, 20, 3, 9, 3, 21, 13, 7, 1, 3
Converting the numbers to letters, on the basis that a=1, b=2, etc. gives:
jjafckgbqgmbakaflcehatcicumgab
Running that through ROT13 gives:
wwnspxtodtzonxnsyprungpvphztno
So, no joy there. But i’m still thinking.