Hi Gary,
go to the "guitar" page.
"Folk" is on button "F4" now.
So press AND HOLD the "F4" button for a few seconds until the display changes.
NMow press button "2/7" and you see the selected 2nd voice.
Press "F1" and change it by choosing a voice as usual ( e.g. "Accordion" and then use the jog dial to select "Master" )
After you´re done press the "save" button and give you "new creation" a new name.