I took a look at your chains, I really like what you did, but my problem is the chain. Your chains are linked together, their actually several toruses that don't actually touch each other in the original state. my chain is made up of hinges, they all connect like on the chain of a bike, and I can't figure out how to connect different points of the chain. The top and bottom should both be connected to a drum pedal head, and the center of the joint should connect to a foot cup, kind of like on a saddle......then if possible i wanted to only have to move the foot cup up and down its motion path and have the chain dynamically move along with it driving the drum pedal heads to actually hit the drum.......??? any ideas??....