+ void destroy_region (boost::shared_ptr<Region>);
+ boost::shared_ptr<Crossfade> find_crossfade (const PBD::ID &);
+ void sync_all_regions_with_regions ();
+ std::vector<boost::shared_ptr<Playlist> > playlists_for_track (boost::shared_ptr<Track>) const;
+ uint32_t n_playlists() const;