Reading about Rainbow-like coloring in this thread:
Obviously this only works straight forwardly if a single frequency can be detected in a snippet of the waveform. I.e. it is a sine.
What is supposed to happen with more complex waveform the Fourier-transform of which features more than one peak ? Should the highest peak (e.g. using "A" weighting) alone determine the color ? This would prevent white (and all unclear and dim colors).
To me, white noise should be shown white
( independent of it's volume, which in the end is consistent with showing silence as a straight white line.
-Michael