Hi,

Is there a software out there that will let me record my voice, then
convert the phrase(s) I've recorded so I sound like an old man, a
woman, a child, an English speaker with a foreign accent, etc.? I have
a short animated script and I'd like to do all the voices myself, but
I don't know if the technology exists to do this. Thank you!

Hi! Thanks for the question.

Here are some software that you can use to change your voice.

AV Voice Changer 
http://www.pcworld.com/downloads/file_description/0,fid,23138,00.asp

Virtual Personality
http://www.triplebit.com/About-Virtual-Person.htm

Voice Cloak
http://www.blazeaudio.com/products/voicetransformer.html

Exho Machine
http://www.scienceshareware.com/sw3.htm

Blaze Audio Voice Cloak v1.1
http://www.sharewareriver.com/product.php?id=7009

VoiceSFX
http://www.blazeaudio.com/products/voicesfx.html

Voice Changer and Funny Voice Software
http://www.voice-changer.net/Voice_Changer_Blog/Random_Blogging_Stuff/Using_a_voice_changer_for_PC_recording_and_landline_use_20050203331.html


Search terms used: 
voice changer software

I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
                 
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Easterangel-ga                 
Google Answers Researcher