For my creative expansion on the servo OR tone labs I chose to make a combination of the two. I used an analog photoresistor input to map the analog tone output for the piezometer standing in for a speaker.
Next I wired the servo to digital pin 3 and mapped the servo angle output to a potentiometer's analog input into analog pin 5.
Then I added a fan-blade or light blocking "flag" to the servo motor's blade/axis and positioned it over the photoresistor/piezometer to modulate that circuit without needing to go through the Arduino.
