_session->route_group_removed.connect (_session_connections, invalidator (*this), boost::bind (&Mixer_UI::route_groups_changed, this), gui_context());
_session->config.ParameterChanged.connect (_session_connections, invalidator (*this), ui_bind (&Mixer_UI::parameter_changed, this, _1), gui_context());
_session->route_group_removed.connect (_session_connections, invalidator (*this), boost::bind (&Mixer_UI::route_groups_changed, this), gui_context());
_session->config.ParameterChanged.connect (_session_connections, invalidator (*this), ui_bind (&Mixer_UI::parameter_changed, this, _1), gui_context());