source= http://www.piclist.com/piclist/2003/11/24/081045a.txt?

Olin grumps "You need to cut the hand waving and give us a clear spec."

Two photo-sensitive inputs. Input will be sensitive to low audio frequency
pulses of light, rather than steady light levels. One LED output.

With no input, the output flashes at a "rapid" but visible rate (1KHz?).

If only one input is active, there is no change in the output.

As the input frequency increases, assuming both inputs are activated, the
output frequency decreases.

When both inputs are receiving "rapid" (1KHz?) pulses, the output is
completely suppressed.

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