+ void model_changed ();
+ void model_automation_state_changed (Evoral::Parameter const &);
+ void model_contents_changed ();
+
+ std::set<Evoral::Parameter> _filtered_parameters; ///< parameters that we ask our source not to return when reading
+ PBD::ScopedConnection _model_connection;
+ PBD::ScopedConnection _source_connection;
+ PBD::ScopedConnection _model_contents_connection;