OK, try this and let me know how it goes. I’ll be using this link for testing so I don’t burn up all of my upload credits on the production site.
https://cqsys-ares.com/mark_sandbox/app.html
Go to the Side Bar Menu and expand the Accessibility section. There, you’ll see the new Foot Pedal / Page Turner assignment buttons. Click on the Set buttons and tap your pedals.
Now, since iOS already has the Space Bar assigned to scrolling the browser page, you may not be able to use that, so if you tap Set next to Play / Pause, then tap your pedal, and the app shows “Space” you’ll need to change your pedal settings to something else. From what I’ve read, your Joyo should have that ability.
Looking forward to your report.

thanks for all you have done with this! I never expected you to go to so much trouble. I’ll give this a shot later this morning when the rest of the family wakes up and let you know how it goes.
)