OK, I changed the mouse wheel setting (in the control panel) from 3 lines to 1. But no change in Calibre viewer behavior -- the wheel still scrolls 7 lines at a time, and more to the point, it's a discrete jump of all 7 lines.
Still seems to me that the easiest (I am guessing) solution is to make the scrolling smooth rather than discrete, whatever the number of lines.
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