I have a Mission expression pedal attached to the foot controller, used for volume swells - taper seems to work fine throughout the range of the pedal.
However - when switching to the looper, in record mode, the taper of the pedal changes/becomes more abrupt - you can feel a bit of a zipper effect which makes swells almost impossible to execute cleanly - has anyone else experienced this?
Also - I'm finding that when in Looper mode, the footpedal suddenly switches to tuner mode, or back to the performance mode view, intermittently. I didn't notice this before I had the expression pedal connected to the footpedal, so perhaps these things are related?
If anyone has any thoughts/remedies on the above, I'd love the help 
Thanks!