The speed of playing an instrument depends on your fingers or arms in the case of the trombone or percussion instruments. The faster you move your fingers, the faster you playing gets. There is the whole thing about angles. If you lift your finger too high, it would be a little difficult to play fast. But it would be great if you were playing slow. And if you lift your fingers not high enough, then your playing will just sound like a blur if you were playing fast. But if you lift your fingers just the right hight, you get the perfect speed of sound, no matter if you are trying to play fast or slow. You can actually calculate the speed by using the formula and plugging in the numbers and then solving.
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