Here's the latest Amazing Band animal Keyboard fresh off the bench. I'm doing a sequence of these keys and they are available for $75. Seems we made the top 13 of most bizarre bent kids devices on Synthtopia.com
For wire up info check out the Butterfly vid on Photo-resistors and Potentiometers. I did the same thing here. Clock resistor to the middle terminal and V+ and V- to either side depending how you want the knob to work. Most times adding extra resistance can make this bend more stable. I also use Photo-resistors to buffer the potentiometer and that can be fun.