[Zubersoft]

The first thing is to verify whether or not MobileSheetsPro is receiving any of the key press commands from your pedal. Please try switching the BT-200/S-4 to pedal mode 3 (which is page up/page down). The next thing you need to do is to see if the pedal is communicating correctly with your device. To do this, load MobileSheetsPro, tap the three dots at the top right and then Settings->Touch & Pedal Settings->Pedal Actions. Tap the keys field for pedal 1, tap the clear button, and then press one of the pedal switches. If you see a key show up on the dialog, then your pedal is communicating properly. In that case, tap OK, assign the action you want to use from the dropdown and repeat these steps for pedal 2. If nothing shows up, there is a communication problem between your device and the pedal. You can try going to the bluetooth settings, disconnecting the pedal, forgetting about the pairing, then discover the device and pair again, and then try checking MobileSheetsPro as I described above. 

It may be worth seeing if the pedal is functioning correctly outside MobileSheetsPro. For example, if your pedal is set up to use mode 3 which is page up and page down (or mode 2 which is up arrow/down arrow), then that means you should be able to use it with the internet browser on your device. Load a web browser, go to a website that has a lot of content and can be scrolled vertically, and press the pedal switch. If nothing happens, you know that it's not working with your device properly. There is nothing MobileSheetsPro can do about this I'm afraid as it's either a hardware or OS issue.

Mike