I love those gizmos. Interesting to watch.
However, I'm quite sceptical of internet videos (and stories) so I wonder if perhaps the music is partially or fully dubbed into the video.
It certainly seems to be actually produced by the machine when he used his hands to manually open the ball gates.
Link below to see similar fantastical machine but this one is cgi (computer generated imagery). I originally watched it on a DVD of international cgi awarded short films.
https://m.youtube.com/watch?v=IOmFgIxvVzc