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Keilwerth saxes (S/A/T), Selmer clarinets (S/B), Altus Azumi flute
3,476 Posts
I think you want the keys open enough to get the tone you prefer, but not so open that your note to note reaction time is adversely affected.
I don't think "reaction time" is a real concern with these small differences in opening (e.g., consider the much larger differences in key openings across tenor, alto, and soprano). Instead, the main concerns are (1) intonation and (2) evenness of timbre. Saxes are designed with the effects of key venting as an important consideration. If you substantially change the key venting from the design specifications, then the note-to-note relationships will no longer be correct.
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