Thanks @Bakerman
A. Makes sense. If I tune the guitar down 1/2 step normally but decide to tune back to E then this could be used to quickly make sure the harmonies sound right. Is this correct?
B. I’m working on Hotel California. In the verse harmonies the scale/key changes so I would have to adjust the key parameter, correct?
A. Yes, key parameter allows quick adjustment when sounding key changes.
B. That's one possible approach. With a custom scale you'd only need a key change for the F# having A vs. A# above at different times. With normal intel. harm. mode the bend/release will sound better, but a few additional key changes would be needed. Using channels to also alter the scale type, the least switching would probably be this:
B harm. minor, B Dorian, B Aeolian, B harm. minor