So far, nobody's mentioned how to get to the aforesaid knob in the
first place, or alternatives
to manipulating it.
Navigating with the mouse is a poor second to precise locating, and
using qwerty actions to set values, be it a knob or slider, is more
So, tab, or an associated action to get to the knob in the first
place, and something like ALT+ up/down arrows (as an example) to change the knob
value. Then it's irrelevant whether the knob responds to mouse
up/down/left/right, or mouse wheel, for users who find those options
second best, when a more efficient and precise option already exists.
For graduated speed in the case of a spin knob (starting slow and
getting faster), the user only needs to
keep the actions pressed.
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