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Re:12 Piano notes made visible for the first time by hamai on Friday January 25, 2013 @05:57AM (#5114902)
I guess they could be using "partials":

>Any complex tone "can be described as a combination of many simple periodic waves (i.e., sine waves) or partials, each with its own frequency of vibration, amplitude, and phase." A partial is any of the sine waves by which a complex tone is described.

http://en.wikipedia.org/wiki/Harmonic_series_%28music%29#Par...

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