How do you make your voice sound like a chipmunk on a mac?

first, open iMovie

record your voice while talking really slow and pronouncing your vowels more than you normally would.

click on the clip and drag it into the project part of iMovie

then, roll the mouse over the clip and click on the little blue square. then click on "clip adjustments"

click the box under "video effect". this will allow you to adjust the speed

now, set the speed percent to 200% - 250% depending on how low your normal voice is.

click "done" and that's it!