How to automate "transpose snap" in Vital synth?

I assumed that each note in the transpose snap effect would map to one parameter to modulate (11 in total). But it seems the entire snap effect is mapped to a SINGLE parameter. So all 4096 scale possibilities are mapped to a single envelope? How are we supposed to automate that? Is the mapping documented somewhere? I can’t see the notes changing in the effect when automating, although the sound changes. Has someone figured out how to do this please?