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I suspect preventing the pedal from changing songs stops it from any action since it requires a touch action to advance. 
In the pedal action setup there is a 'return to start of song'.
I think I tried this a long time ago and just turned on the repeat with no other settings from using the touch screen to advance. It didn't work too well for me so I ended by not using the repeat, just the return to start on pedal 1 and advance to next song on pedal 2.