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The reed vibrates at a frequency sympathetic to the horn resonant frequency, which is different at each fingering/note. The reed vibration is what excites the column of air in the sax that in turn amplifies its sound. You can feel the difference in tong tickling sensation when you slightly touch the reed, comparing a low Bb note and a higher note for example.
 

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Yeah, reeds work really hard to shape the sound we make spanning a 1-2.5x frequency range for most (wider range with altissimo). And they do all that work soaked in spit. It makes you appreciate why they have the lifespan they do, and why they are constantly changing with environmental conditions.
 
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