Is there a preset on the H7600 to emulate a 12-string acoustic guitar? I already have a clean acoustic tone coming in, I'm only interested in the second octave strings. the trick is that the high-E and also the B strings are not raised by an octave as the strings are the same. Dunno how to do that except is there a way to have the octave module do nothing if the frequency coming in i higher than some input?
You could try using a Custom Scale Shifter preset, creating a custom scale where E and B are set to unison and all other notes are set to +1200. That my work, even though a polyphonic source is not the best for pitch shifting.
A guitar with separate strings outputs would be the perfect one to pitch shift!