* Make a selection as we do now on an event, and this will add two control point to the red line. If you move the red volume handles on the selection, the control point are moved and added. If you never touch the red volume handles, no control points are added. This makes sure that when you make a selection, control points are only added when you move the volume handles.
That would again raise the problem that there's an effect outside of the selection aswell. To me this way seems counter-intuïtive... Jens