V G wrote:
> http://das-labor.org/wiki/Stimmmopped/en
>
> What is the purpose of having two LEDs?

As that page states in the first paragraph:

  "The two LEDs on the board blink with the frequency that the chosen tone
  has. When the string vibrates with the correct frequency, two lines are
  projected at a fixed position on the string. If frequencies don't match,
  the lines appear to be blinking or moving to the observer's eye. The
  moving or blinking effect decreases with decreasing difference between
  the two frequencies."


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