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can anyone help with this one...

Dear List,

I am designing a study in which I planned to "morph" female voices into male voices
and vice versa. The method I tried was simply to change the pitch (using GarageBand,
although I also tried Audacity). At first I tried small transpositions, just  3-4 semitones up 
or down. 

Our task is to identify individual speakers. The problem is that the speakers were easily 
discernible before the transformation, however, after the transposition, none of our pilot 
subjects were able to differentiate between the various speakers. 

Can anyone help me understand what is going on? What is known about the acoustic information 
people use identifying individual speakers? Can anyone suggest a better transformation?

Thanks in advance,