This idea is similar to how some MIDI controllers work where the state is indicated by an array of lights around the knob, and the knob is an encoder which rota

This idea is similar to how some MIDI controllers work where the state is indicated by an array of lights around the knob, and the knob is an encoder which rotates endlessly. A popular and cheap example https://www.behringer.com/product.html?modelCode=P0B3M https://www.behringer.com/product.html?modelCode=P0B3M This makes it possible, for instance, to map knobs to adjustment controls in Lightroom and have the knob "change" instantly as you move between photos that have different adjustments applied.