I've done it on a part or two to emphasize a part. I've also detuned or put a little chorus on the doubled one and that can change the sound, sometimes making it sound fatter, sometimes just weird - experimentation is the key for me.

But I think if you did it to all the parts, it would sound pretty much the same.

I'm also talking MIDI here, I do most of my editing with MIDI because (1) it's easier to edit MIDI and (2) there are hundreds of edits you can perform on MIDI that you just can't do with audio yet.

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