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Knob

Drag around the knob, scroll over it, or focus it and use the arrow keys.

How it's built

The body is a satellite 15 lanes wide on orbit-0. A satellite is a universe too, so the .gravity-spot inside it places the indicator dot relative to the knob.
Turning the knob turns that inner ring with rotate.
Ticks and the progress band share range-270 from-225; ticks light up with a class.