why doesn't MIDI learn work through the zebra2 and mfm2 user interface? I know this can be done in the envelopes window in reaper, but it would be so much faster in zebra2 or mfm2. I hate going through the long list of parameters in the envelopes window. and there's no logic to how they're listed since every plugin is different. definitely poor work flow

Works here for ZebraCm. Can you clarify what steps you are taking to do the MIDI Learn? Or do you mean MIDI learn by twiddling a knob on the VSTi GUI?

if you right click a parameter in z2 or mfm2 you'll get a menu which includes midi learn and unlearn. maybe i'm missing a setup in reaper

I just noticed that the track must be record armed for midi learn to work. huh?!