I love this so much. It’s so simple: if you can make a tone by blowing across the end of a tube, why not automate it? Instructions here! This is apparently inspired by a Japanese movie called Eri Eri rema sabakutani, in which “the protagonists improvised a lot of cool instruments with the goal of making a pure and beautiful noise.”
I can think of a couple of things to try here: closing off the tubes at the “fan” end, and varying the lengths of the tubes to get a chordal drone. If anyone tries it out, please post your results!