I did solve this using the Yamaha device and by simply writing a command into the top of each song in OnSong that corresponded with the patch I needed. The command sits under the title and metadata of the song and simply reads "MIDI: CC32:005 PC:023. This is an example and will change based on bank and patch. This was life changing and when playing live I simply flip OnSong to the next song and the POD takes care of itself. There is a little bit of work involved in making sure the Yamaha device is connected to the iPad but it takes only seconds and now I do it without thinking. I would be happy to post in more detail the equipment, apps and process if you think it would help. Scrolling etc is possible but ridiculous fiddly and I actually found it problematic. Now I don't need my feet to change patches on the POD, I simply use an Airturn pedal for start/stop/scroll etc.