Testosterone is also responsible for a boy's voice change. It causes the larynx to grow larger, and your vocal cords to get longer and thicker, which changes the pitch of your voice.
During the "growing season" of your larynx and vocal cords, you could be talking in a normal tone of voice and all of a sudden your voice will crack and you'll sound high and squeaky. The effect is a lot like when you have a mild case of laryngitis.
Most boys find this pubescent voice-cracking embarrassing, but until your voice has settled down, usually within a year or two, there isn't a lot that you can do to prevent this from happening.
YOUR VOICE CAN'T CHANGE NOW. WE'RE ON IN FIVE MINUTES!
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