You could learn to do it old school..... just make up a voice with your voice. I use voice altering stuff in my youtube movies here: http://www.youtube.com/user/SodaGnome but then I've met a lot of people. well animals/elves etc who just make a new voice on their own. I've met a few people who do cartoon voices for tv and it's amazing what you can do with your own voice if you pratice or try.