Hi A,
To drop tune use the PitchFlex effect type. It is chromatic, ie it does not rely on key and scale tracking for pitch shifting.
In PitchFlex, turn the Mix knob to 100% Wet and Pitch Mix knob all the way counter-clockwise to Pitch A.
Now set both Pitch A and Xnob to "-m2" (minor 2nd) and you're done.
