Blair Neal's device
Blair Neal made a device that uses a projector wired to a computer to sense drawings (on projector sheets) as they pass over a sensor. The computer turns them into whatever sounds have been assigned to different colors/positions on the paper.
He gave his code to someone else who made their own version of his machine that works with normal paper. He uses mostly prints/illustrations to trigger the sounds rather than dots and lines like in Blair's.
This is the next page of the manual I've been working on to help show the relationship between sound and light wave frequencies. It needs more work - I should have started from E so infrared and ultraviolet would be at the ends of the spectrum rather than overlapping:
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