Circuit Bent Elmo's World Phone
This Elmo phone has a pitch control (yellow knob), a 1/8" audio output jack, audio selector switch, distortion and loop/drone glitch. The drone and distortion operate from the same toggle switch. A three position switch ((ON)/OFF/ON) is used to select between the two glitches. The Drone effect is activated with the momentary position as it only takes the slight signal to put Elmo in a crazy state.
Check out the video:
The pitch potentiometer completely replaces the pitch resistor on the circuit board. There are several bend points that affect his pitch, but I saw no sense in repeating the same thing. The distortion and drone effect mainly feed from the audio portion of the circuit but routed with some added capacitors and resistors of choice.