Either blind or stupid, I can’t find the way to assign modulation targets or destinations for any of the 13 available mod sources found in the edit menu. In fact, I can’t find the words target or destination anywhere in the Falcon universe (GUI or help content). Mystifying. In every other synth I used, hardware or software, mod target choices are glaringly apparent.
Right click on a parameter you want to modulate, then assign a modulation source, it doesn’t work the other way round.