Voice modification program

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Hi, I need an easy to use, n00b friendly program that I can use to record, then modify voice. Basically do stuff like lower my voice, etc. It's for a flash video and I can't get a deep voiced guy to do it for me, so... I'm the voice actor! =D What's even more scary is that I hope I can modify my voice so I can do the female too.

Right now I have an SBLive5.1 and a working microphone.

Thanks for your time.