I was also curious so I had a look myself. If you use the spectograph editor in audacity you can see the pitch line (just above 15k)! The two lines at the start are the 2 clicks
Viewing post in SWITCHING IT! jam comments
I see now on my files too, it was just meant to be a low hum, damn I didn't even think about that. When I was younger I suffered ear damage so I cant hear frequencies above 12.5kh. It reminds of a Tom Scott video.
Iv added a warning to the game page, you can take pride in your good hearing!