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You might have success exploring other software for your voice pitch changes. Praat is freeware designed specifically for speech analysis/manipulation, and the pitch manipulation is very strong. It is called PSOLA (pitch-synchronous overlap-add), and can be used to change duration as well. I have found that other software changes gross spectral properties even though you only want a pitch change - Praat avoids these. There is also a Matlab package called Straight that has been used to perform some of the manipulations you mention.
Some of those gross spectral properties (e.g. locations and relative amplitudes of the formants) can be strong cues for gender (or at least talker size). These cues go by different names and are sometimes elusive in measurement. Among these are harmonicity, spectral tilt and glottal open quotient. If these have been altered, it might explain some of the pitfalls you mentioned in your post. To put it simply, if you multiply F0 by 2, you want to avoid multiplying the formants by the same amount. I suspect that GarageBand and Audacity might not be successful at that.

There is a lot of stuff out there on vocal quality measurement, and there doesn't seem to be one conclusive way to measure it. This work is summed up nicely here:

Maryn, Roy, De Bodt, Van Cauwenberge, and Corthals (2009). Acoustic measurement of overall voice quality: A meta-analysis. J. Acoust. Soc. Am. Volume 126, Issue 5, pp. 2619-2634

Regarding acoustic cues for gender, you might want to check out this recent paper:

Hillenbrand, J.M., and Clark, M.J. (2009). The role of F0 and formant frequencies in distinguishing the voices of men and women. Attention, Perception, & Psychophysics, 71, 1150-1166.

I haven't looked at that one in a little while, but I'm sure that it contains sufficient information for this issue.

On Tue, Sep 6, 2011 at 11:56 AM, Brittany Guidone <brittanyguidone@xxxxxxxxx> wrote:
Dear List,

To explain more about my original question:

I mainly want to know if "morphing" or "changing" the pitch of a male voice by positive 4 semi tones will change the components of the original male voice (before it was morphed) in a way that will make the two voices have different components or "make up" in comparison to one another, besides the fact that they will have different pitches.

In other words, when the pitch of a voice is changed in audacity or garage band then what other components of the voice are changed (besides the pitch shift)?

Sent from my Verizon Wireless BlackBerry