I can hear a bit of a static hum in there as well as see it in the WAV. It's not of the 50 or 60 Hz variety though. I had that problem once before when my system wasn't properly grounded. Edit: Here's the waveform if you want to look at it. Note the vertical highlighted section of selected area, which is a silent part of the file, and the horizontal green dB level along the bottom, indicating noise as the section is played.
Did I mention that Zorn trains his cats to play PnP? They've been doing it for almost a quarter century now. They're a little slack on the RP aspects, but great at the dice rolling part. So was it Zorn or Max on the recording?