Aural Organ
Frequencies vary.
It is not the pipe that makes these sounds, it picks them up from the surroundings.
Listen to the pipe, what do you hear? And what do you hear when you turn the crank?
Depending on the length of a pipe, we tend to hear high or low tones from the surroundings. If you move the piston up or down, you determine the frequencies of the sound waves that vibrate in the pipe.
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