Super cool. Is there a gender button somewhere? sounds very male to me but there's no difference in voice/sound production between genders other than just the exact pitch, right? Can you get it to make sounds like a woman or only a man?
There is (typically) a difference other than pitch. Formants will be in slightly different locations [1]; the energy in the spectrum is balanced differently; there is more aspiration noise [2]. You can model the latter somewhat with this tool by moving the voice source box down.
I've been creating a speech synthesiser recently and it does seem like simple approaches produce a voice that is more passably 'male' than 'female', even accounting for the pitch. Aspiration added with white noise sounds better but doesn't quite get that breathy quality across. I think more sophisticated techniques may be needed.
