Graphite is used again as a resistor in the optical theremin circuit. This time a contact is placed on a 'Magic Mate', which ocsillates back and forth (moving the contact back and forth across the graphite contact). The 'Magic Mate' is voice/sound activated; when activated it talks, lights up, and moves. When the device hears a sound it turns on two LEDs; these LEDs could be replaced with relays, etc to turn other devices on or off.
Here is an images of the top side of the 'Magic Mate', the contact is connected through a srcew hole on the outer rotating ring. This images show the location of the small contact of the right. This is the altered drawing surface after the movements. Here is a video of the device + the sound circuit in action:
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