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A tuba makes a sound when the musician buzzes their lips into the mouth piece. The buzzing plus exhaling breath sends vibrational waves of air through the tuba eventually exiting through the bell of the tuba as the noise you hear. The pitch is controlled by how tightly the musician buzzes and the length of horn the vibrational wave must travel, which can be changed by using different combinations of valves. The volume is changed by how hard the musician exhales into the tuba.

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12y ago
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Q: How does a tuba make noise?
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