![]() The cycle repeats at a constant frequency and emits a note related to that frequency. ![]() The high pressure normalizes and the cycle restarts.When the high-pressure air arrives at the open hole, the air coming into the bore abruptly changes direction and goes out through the hole.A wave of high-pressure air moves towards the first open hole. The moving column of air is stopped by the sudden collision with the pressurized air coming from the player's mouth.Once all the air in the bore is at atmospheric pressure (moving towards the mouthpiece), the difference in pressure between the two sides of the reed decreases and the reed returns to its original position.The incoming air normalizes the pressure within the bore, starting at the open hole and moving back towards the mouthpiece.The air that was previously leaving the clarinet through the hole changes direction quickly and enters the bore. The outside air, at normal atmospheric pressure, is sucked in by the low pressure inside.The wave of low-pressure air moves down the bore and arrives at the first open hole.The difference in pressure between the two sides of the reed increases, causing the reed to press against the mouthpiece. This creates a low-pressure area in the mouthpiece. The minuscule space between the mouthpiece and the reed allows only a small amount of air to enter the instrument. ![]()
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