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From the image, it looks like FOOTSWITCH is assigned to BOOST, which means whenever you step on the BOOST button, you’ll only ever hear the effects from the boost setting. FOOTSWITCH can also be assigned to the LOOP where your H9 is connected. Try setting that to LOOP and pressing the BOOST button. That should engage the loop for you.
If you want to keep the effects loop on all the time then you have to depress the button on the left side of the PZ-PRE next to the output. I’ve attached an image from the manual for you to see what I’m talking about. What is weird is I’m seeing images online that indicate that switch is there, but I don’t see it on your version. If you don’t have this option, you probably have an older unit and have to resort to keeping the loop on using the BOOST option above.