Just bought a used AX8. Expression pedal in Pedal 1 is wah but I want to change it to Global Volume. In the manual Step 2 is NAV to the entry for the volume you want to control. Did that. Step 3 - Change the value for the desired entry to PEDAL 1-4. How do I do that? Am I supposed to hit enter after selecting OUT 1 (MAIN) VOLUME and then NAV to Expression Pedal 1? If not, how do I get to Step 3?