How do I edit audio to get a walkie-talkie effect?

I want to record something and edit it so it sounds like the radio talk in call of duty 4 or something. How do I do this? I have cool edit pro and audacity. How do I edit audio to get a walkie-talkie effect?
Easily the best free Audio Editing software available is Audacity:

http://audacity.sourceforge.net/download鈥?/a>



You can use it to record Audio from files, microphones, even record cassettes as MP3 files using the Line In port on your computer. You can also mix many separate files together into one track. There are also many options that allow you to play the music file in reverse, changing the pitch or tempo and many others.



Hope that helps.

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