Freeform analog circuit
I finally settled on a circuit for the analog section of the lip syncing circuit. There’s a dual op-amp, a few resistors, two capacitors, a potentiometer and a diode. It was getting to be a hassle to keep it on the breadboard, but we didn’t have time to make printed circuit boards. So I soldered it all together free form. Here’s an air-wire sketch:
Finally I encased the whole thing in hot glue. It keeps the parts from bending and breaking, and it’s pretty much waterproof.