Yes, Henry, that is very much the way it should go. In fact, if you look at my most recent coding attempt which I included in my earlier post today, I have changed the LED count to 7 (though would like to make it 9) and have actually been using a different color for the center led than the rest which were split into two colors, one for each direction. I had even pondered using a tricolor LED for the center, but thought I should at least get the main code down before incorporating yet more complex scenarios. I seem to have the hardest time combining the various example sketches I borrow from, to work all together, much less simply modifying the single examples themselves which can be confusing enough to me.
Anyway so, yes, I do agree with your idea mostly however, I think I would prefer to have the LEDs stay lit as they increase towards their respective direction and likewise, to turn off as they return towards the center position.
For example, with 9 LEDs total, there would be four steps in each direction away from the center LED. If the knob is turned all the way left, the servo will be rotating at its max speed backwards, so the center LED and all the LEDs to the left of center, will be lit. As the knob is turned to the right from that position, the LEDs left of center, will gradually each turn off as the position moves closer towards the center. As the knob turns to the right, passing the center, the LEDs to the right of center will each turn on incrementally as the position moves farther to the right until the knob has reached its max forward position when all LEDs right of center will be lit.
Does that make sense? If so, and it is doable, would it be easier to adapt the code I have been working with or is it best to just scrap that code and start over with a fresh sketch?