code: private void processControllers(Set<Control> controls, Glyph process) {
  		for (Control ctrl : controls) {
  			Glyph g = createControlStructure(ctrl); //if ctrl has upstream controls (modulations), they're processed as well
  			if (g != null) {
  				createArc(g, process, getControlType(ctrl), null);
  				processControllers(ctrl.getControlledOf(), g);
  			}
  		}
  	}
docs: Associate all the controllers of this process;