Comment by kazinator

It does, but that is deceptive. Voice is determined by the pitch of the vocal tract and the spectral filtering caused by its shape: the "formant". Both can be manipulated digitally to create different voices.

I do perceive that there are abrupt transition in the voice as you move the so-called frequency slider; that could be due to abrupt changes in some parameters (like table lookup from a small table keyed to the frequency parameter or something).