Not working on Fl Studio.
Hi! Can you share a screenshot/details of how you have the plugin setup in FL Studio? I don't have FL Studio myself but a screenshot might at least help debug.
I did come across this page on MIDI out -- the "Controlling internal VST plugins" looks like it could be helpful:
https://www.image-line.com/fl-studio-learning/fl-studio-online-manual/html/plugi...