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Remember that at very, very high Qs, the resonator will lose only a very tiny fraction of its energy per cycle, and thus be almost inaudible. I've done some preliminary measurements on a different oscillator in and out of a vacuum chamber; the Q changes by a factor of several hundred due to damping from the air. They're wanting notes to last for quite a while, which of course means that a given note can't be very loud (conservation of the mechanical energy which is released from the vibration of a tine). At a typical frequency of 1 kHz, they want a Q of something like 3000 (this is roughly what I found from the sound files they sent); I hope to keep Q very roughly constant at all of their frequencies, with
maybe a few twiddles here and there, depending on what their "expert" wants for his compositions. It may only be possible with some tricky engineering.