Apple MainStage - Manual (Page 83)

Chapter 7 Working in Layout Mode 83
Because of the wide variety of possible layouts, not all assignments and mappings may
be converted as you intended, depending on the differences between the layouts.
After you import a layout into a concert, be sure to try the screen controls in the
concert to see if they work as expected. After importing the layout, you may need to
manually reassign some controls and then manually remap screen controls in your
patches for the concert to work with the new layout. If the imported layout has fewer
screen controls than the old layout, or has different types of screen controls, you will
likely have to add new screen controls after importing and then assign physical
controls to the screen controls to maintain the same level of functionality.