I know how it works but it's hard to explain. :v
It works only for the first 2 times.
The pitch changes while the tone stays the same.Yet the change in pitch is so miniscule, that we can't notice the change from the end to beginning.
It would be so much better if the video looped.
http://www.youtube.com/watch?v=ugriWSmRxcM?loop=1&autoplay=1
Didn't work