Hello friend Keithvenn!
Looks like no one answered your question.
I find it very simple to do what you are looking for.
After connecting the pedal, press the "Direct Access" button and then step on the pedal.
At this point, the pedal functions will appear.
Now on the "1" button (down arrow), go down until you find the "Talk On/Off" function (Switches between Vocal and Talk in the Mic Setting),
it is the 38th function after the "Sustain" function, almost reaching the Final.
Now just step on the pedal to activate or deactivate the "Mic Talk" function.
You may need to save to Registration Memory so you don't have to do all this "script" every time.
If you can't, ask a little more, I'll be happy to help.
I hope I helped you,
Enildo