The resistance created by the graphite is shared among two LEDs. The greater the resistance the dimmer the light becomes; by placing the contact point closer to one LED makes it brighter and the other dimmer. The light emitted from the LEDs is used to activate the phototransistors of two optical theremins; each produces a tone/sound relative to the quantity of light. These tones begin to vary as the contact is move from place to place. One optical theremin may produced a low pitched tone, while the other produces a high pitched tone. Graphite controlled light is used to produce sound.Here is a video of the effect:
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