My "200 or more" controls was an fictive example, you cannot add 200
But to create a smooth panning effect you must add a consistent number of controls, you cannot add only 4 or 8 controls in a 4/4 measure, there are too few. Maybe 16, or 32 are enough, but you can accept only after you hear the style playing. That's why the best approach in my opinion is to let user choose if number can be increased or decreased after you draw the line in MultiEditor
Or could be a number which take care of base tempo of the style, if it is a fast tempo, it can add fewer control, if it is slow tempo, it can add more
Regards,
Vali