Sudden, jerky bellows movements cause more valve noise than smooth, gentle movements. Individual playing style also influences the degree of valve noise. The lower the note, the louder the valve noise and the longer it will persist. The length of the decay time is primarily dependent on the length of the reed, and because the lowest notes, especially in the bass, are produced by the longest reeds, their valve noise is the loudest and most longlasting. Because there is a cushion of air in the reed slot, between reed and valve, these reed vibrations are transmitted to the valve, causing it to rattle against the reed block and thus creating the noise. When the key or button is released, the reed continues to vibrate for a short while under its own momentum. Here’s what happens: When a key or button is pressed, the airstream from the bellows strikes the corresponding reed and it begins to vibrate, creating an audible tone. The degree of valve noise varies from one model to another and most players do not find it disturbing. To better understand this subject, it’s helpful to take a look at the cause of valve noise, which occurs with all valved reed instruments, especially in the lower and bass registers.
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