In the following thread:
http://www.freerepublic.com/focus/f-chat/2834301/posts
prisoner6 in post #19
x_plus_one in post #31
kelly4c in post #55
BUT...
Despite three Freepers chiming in, it could just be coincidence. As others have pointed out, the combined video on youtube reuses audio for different locations (bird chirps are exactly the same at different points in the video). Moreover, not one camera person speaks. You’d expect to hear, “Did you hear that? I’m outside taping this weird noise in Kansas. Listen. Listen. There it goes again. Kind of a humming sound.” Etc.
But there is NONE of that. That alone marks it as BS in my book. People can’t help but narrate their videos.
The Alberta Canada footage is different from the others though. There are reactions of the three people in the video.
But we do have two FReepers on this thread who have heard this.