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Crikey! What are you intending to show? The ear doesn't hear like you are demonstrating this on the screen - we don't hear linear samples in this way. We hear sort of a windowed FFT of the waveform. In order to "look" at the effectiveness of various dither types you really need to take these various signals and run them into an FFT analyzer and "see" what the effect is on the frequency content present. For more check the following:
http://www.cadenzarecording.com/papers
And read the first paper listed on dither. It "shows" in a visual way the effect of adding dither to a signal through FFT analysis. What you have done here is really useless, misleading, and unhelpful.
Nika
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i understand that you cant tell whats going on spectrally from just waveforms... these are just screenshots from my own dither test. I normalized the files so i could hear what the dither was adding (well hear better atleast).
I just thought the waveforms were interesting and thought i'd share..