Rodney, I confess to being little sensitive to sound, although by listening to my machines I can tell what needs oil or even when my bobbin is about to run out sometimes.
I really seriously love the hypnotic gentle click-click sound of the bullet shuttle in my 127, or the purr of my Featherweight -- the 99 is just not my preferred "speed" so-to-speak. But, I must give Miss 99 plenty of credit for being a very well-behaved and very fast workhorse. (Hmmm, perhaps I should evaluate whether my relationships with my machines is becoming unhealthy...
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