I am currently using the Transpose function, but during the song I want to also add in a low octave and use the expression pedal to determine the amount of mix for the octave sound. Currently I can use my pedal to turn on/off the octave using the Pedal Pitch: Heel at 0, Toe at -12 - however, this only turns on the octave at the mix I've set.
Instead I'd like to keep the pitch at -12 (maybe using the Chromatic Pitch with Voice 1 at 0, Voice 2 at -12) and use the expression pedal to morph the mix from 0 to 25% - this would provide the illusion of a increased octave sound as I rock the pedal. I've tried to set morphing by rocking the expression pedal and changing the mix %, but it's not working.
I have checked the manuals and various youtube videos, but the ones I have found are only focused on setting up expression pedals for Volume, Wah or Pitch shifting only.
Is this possible and am I just doing it wrong?