All sounds are created by vibrations. The end of the straw vibrates therefore creating a sound. You can make the sound deeper by adding more straws to the non-pointed side. You can make it higher by cutting off part of the straw.
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Cool quick project! I made one of these right after I watched the video! I just voted for you!
Very good very quick project! I made these when I was a kid...brings back memories, when you had to get ideas from paper books :D You got my vote!

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