So far no luck for me.
I've tried the parallel stomp route with a chromatic pitch shift and studio EQ shelving off a bit on the top end so the E string is completely free of the effect and B string about 25%.
Also put a chorus on the other path with a crossover around 400hz or so to stabilize the bottom.
All looks good on oaoer but the tracking on the octave is sloppy and the attack is really slow, almost a volume ramp up, no pick attack at all.
Wondering if I am missing something or if anyone has any ideas?