I also should have said that you can use a PEC12R with 24 detents, which gives you precise control when turning the knob at slow speed, but it can cover proportionately more ground when you turn it faster. Or you could even use the push button to shift into and out of high gain mode. I think these options might work better in practice than actually having 128 positions in one revolution, which is only 2.8 degrees per position.