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Derivative, you're only talking about digital or sampled instuments, right?
If the sound source you are doubling is analog or behaves as analog (free running or slightly unstable oscillators), doubling IS a good way to add phatness to the sound. It's essentially like doubling the amount of oscillators. Also in the case of analog, other parts of the synth like filter and envelopes may act slightly different each time, so that may add to the thickness as well. You have to actually record the sound twice, obviously, to get two slightly different sounds.
Don't do it with sampled instruments or digital synths though, that would do nothing but increase the volume, and in the worst case cause some nasty flanger sounds.
I use it very often to get that phat wide stereo image. Record the synth twice, for left and right channel respectively. You get a very nice, stable and wide mono compatible sound, that no chorus or spatial effect can achieve.
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