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You can easily set up a demo to learn how dither works. Just pass music through a noise gate set with the fastest attack and release times. Adjust the threshold until the gate is really chattering away.
Then mix in some noise and you'll hear what dither does. If you eq the mids out of the noise, you can hear what noise-shaped dither does.
A lot of mysticism and technobabble gets applied to what is really a very simple principle. Unfortunately it is not unheard of for software developers to implement dither so poorly that truncation does sound better.
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