Basically, you want to change the pitch without changing the speed. I do that all the time to change my voice into that of different characters in my animations. Sorta how "The Incredibles" director Brad Bird became the voice of Edna Mode in the movie. If you have a Mac you probably have Garage Band, which has tools to do that. You can also record your voice there, or drop in a WAV or AIFF file you've recorded elsewhere. Soundtrack Pro's tools (if you have Final Cut Studio) are even better. Using tools in addition to the pitch adjuster can help you tailor the voice even more, though I confess to not using them much. Finally, if you don't have either of those, The Amazing Slowdowner (www.ronimusic.com/slowdown.htm) is an easy-to-use bargain at $45.00. I have it and sometimes use it instead of the Garage Band and Soundtrack tools. Now, there may be some freeware out there, but I don't know about it. SS