Today I went to a garage sale and bought one of the instruments featured here (for a quarter! what a deal!). Plastic inner tube hand-pump, if you're wondering. That's what the odd high whistling sound is. Other sounds include trash cymbal and more extensive use of the dragged floor tom, glockenspiel played with brush and many, many tiny bells, now hanging in glorious array from a second-hand recurve bow.
I might put some pictures or videos up tomorrow to explain. Meanwhile, I don't know precisely what this guy is doing, but I want one, too.