- sigc::signal<void, Route &> signal_route_added;
- sigc::signal<void, Route &> signal_route_removed;
- sigc::signal<void, Zone &> signal_zone_added;
- sigc::signal<void, Zone &> signal_zone_removed;
+ sigc::signal<void, TrackChain &> signal_track_chain_added;
+ sigc::signal<void, TrackChain &> signal_track_chain_removed;