For someone who might be watching and wondering…
For some reason in the Mod Matrix Assign menu on my hydrasynth desktop (with MPE enabled ofc), it has MPE-X, MPE-Yabs and MPE-Yrel, but not “MPEOff-VC” which I see is in the menu on yours. It means I can’t edit the way my patches interact with what Roli calls “lift”.
MPE velocity release is the same as velocity off labeled in the mod matrix as “Velo Off”