Possibly just user error, but I can't figure out how to map a new parameter to the expression pedal.  I figured out how to un-map, but not seeing a way to map something new without connecting to the Contol app on my PC.

Have you seen the two buttons beside the ribbon? Click the left one to set the starts of mapped parameters->Turn knobs that you would like to map->Click the right ribbon button to set the ends of mapped parameters.