Pitch block question

[Shock410]

Hopefully one of the senior members can help me out with this...
I am looking to control the interval of the pitch with my expression pedal.
On my Digitech GSP 1101, I could use the expression in the heel position to be -6 and in the toe position +3 to get 2 different harmonies.
Where in the pitch block do I go to assign the movement of the intervals?
Any help would be great!!!
Thanks

 

[Bakerman]

Fixed Harm. mode: Voice 1/2 Shift

Intel. Harm. mode: Voice 1/2 Harmony

 

[Severed]

Spend some time reading the manual on modifiers and external control. Then refer to the pitch block section, again in the manual.