I think I've set up the Celeste pedal correctly but I don't notice much if any difference in sound.  Is there a way to increase the effect?  Or maybe I've set it up wrong?  I clicked on the pedal in the interface then selected assign midi event then depressed the pedal on my digital piano.

Control or right click the Soft pedal on the GUI.  Choose Celeste.  Then to to the midi editor (top of GUI in Options). There you can change the range of values for the Celeste function.  Try values like 0.35 or 0.45 for example.

Lanny