+ void port_connected_or_disconnected (boost::weak_ptr<ARDOUR::Port>, boost::weak_ptr<ARDOUR::Port>);
+
+ /** A VisibilityGroup to manage the visibility of some of our controls.
+ * We fill it with the controls that are being managed, using the same names
+ * as those used with _mixer_strip_visibility in RCOptionEditor. Then
+ * this VisibilityGroup is configured by changes to the RC variable
+ * mixer-strip-visibility, which happen when the user makes changes in
+ * the RC option editor.
+ */
+ VisibilityGroup _visibility;
+ boost::optional<bool> override_solo_visibility () const;
+
+ PBD::ScopedConnection _config_connection;
+
+ void add_input_port (ARDOUR::DataType);
+ void add_output_port (ARDOUR::DataType);
+
+ static std::string meter_point_string (ARDOUR::MeterPoint);