How many valves does the modern trumpet have?
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Modern trumpets have most a three (or, infrequently, four) piston valves, each of which increases the length of tubing when engaged, thereby lowering the pitch. The first valve lowers the instrument's pitch by a whole step the second valve by a half step , and the third valve by one and a half steps.
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12
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91
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32
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1532
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43
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62
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16
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10