So I decided to try my hand at a singing skull using the MonsterSheild prop controller. I glued a servo to the bottom of a cheap plastic Barney skull and attached the jaw to it. I then wired it to a EFX-TEK Prop1 board and set the open and close positions. I then connected PIN7 (the trigger) to one of the relays on the MonsterShield prop controller. Then it was just a matter of key-banging (tapping) out the song lyrics.