Four Whistles Version 2

Four Whistles Version 2 is my first attempt at a "calliope" (well, sort of calliope) design utilizing the primitive knowledge I gained from the original Four Whistles model (https://www.myminifactory.com/object/four-whistles-31628). Not being a musician and being more than "slightly hard at hearing", while it may not sound like it this model is attempting to play "Mary Had A Little Lamb" using a balloon to power the whistles and a hand crank to power a cylindrical sequencer. In order to play "Mary Had A Little Lamb", I incorporated four whistles in the design of this model, each controlled by one of four air valves. Each of the air valves are controlled by a rotating cylinder containing small 2.5mm "bumps" that activate the valves in the correct order (the "cylinder sequencer"). In order to minimize air loss and maximize play time, I designed the valves with a 3 degree preload, designed the valve "axles" using a virtually airtight membrane with torsion bars, and as a last defense agai