range control on pitch block like on the boss octave pedal, so you can turn down range control and it won’t do the pitch affect up past a certain point on the fretboard, you can have it doing octave down on the low two strings but it won’t do octave down on the D string or higher…etc. it lets you do extended range counterpoint between low strings down an octave and G/B strings at pitch, really opens up the range of what you can do with one hand. you can roll it with a resonant low pass in front of the pitch block on parallel path. boss just has it on 1 knob integrated
You can currently do that using a split with a crossover. Tom Quayle had a preset doing that, I think