Interested in this subject too. How can resampling change the sound in the intended way? From the technical it is intended NOT to cause any sound distorsion while resampling. What can be said out of the box:
Any kind of resampling is a mathematical multiplication with a square wave and as with all mixing techniques like this will cause new frequencies. A square wave has harmonics itself already so all of them will produce mixing results like Freq A * Freq B = Freq (A-B) + Freq (A+B). To make this become sound sensible: The modulation frequency will have to be selected appropriately. I would consider to perform it that way, that A-B as well as A-B makes sense to the music. One could choose it that way, that e.g. 3/2 of the freq is used and the half and the double freq occur:
440 Hz * 660Hz -> 220Hz + 880 Hz
This will sound very harmonic, I guess. Not sure if it is what you want.
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