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Assuming you're looking for how many valves you might find on a Trombone...

A regular, "straight" tenor trombone has no valves at all. The slide is used to change pitch.

A "valve trombone" typically has three valves, similar to a Trumpet's, to make changes in pitch.

A trombone with an "F-trigger" employs a single (usually, rotary) valve.

Many bass trombones use two rotary valves.

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14y ago

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