Nice to see some double bass enthusiasts on here! I am in the process of building an electronic midi drumset from piezos, some old stationary cardio equipment and an alesis dm5. The tooling, oh the tooling. Taps and dies, welding, now i need a lathe to make a double bass pedal from scratch... Www.gpsn.uspto.gov is a great resource for technical info and also creepy government technology. Ill post when i can. Peace