I haven't tried it yet, but I have the voice alteration software from this link.  If it works (if, if, if), it seems like it should be nice.

http://www.audio4fun.com/

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.