Technically it’s pitches, not notes, being rotated, but that doesn’t rhyme. Eight carefully stacked voltages enter a ROTATOR. A few of them at a time leave and pass through LEAKAGE to the V/8 input of BASAL. A little pitch shifting and a (100% wet) reverb and “there it is”. Stack notes the way they like and they’re stable whichever way you turn them!

Thanks for the indispensable Submarine SS-220 and the very neato Hetrick Rotator