+ std::vector<GhostRegion*> ghosts;
+
+ /** a list of rectangles which are used in stacked display mode to colour
+ different bits of regions according to whether or not they are the one
+ that will be played at any given time.
+ */
+ std::list<ArdourCanvas::SimpleRect*> _coverage_frames;
+
+ ARDOUR::BeatsFramesConverter _time_converter;