Just to clarify. The articulations available will always be determined by what the VSTi/Preset offers. You can’t create new articulations for an instrument. That’s because, using your example, having a vibrato articulation can only occur if the instrument includes samples that have vibrato (or can mimic it in some way). If the instrument doesn’t have the capability of producing vibrato, adding a vibrato articulation to a map will not magically give the instrument that capability.