diff --git a/libs/ardour/ardour/plugin.h b/libs/ardour/ardour/plugin.h
index 3144302e43..8eecfacfa2 100644
--- a/libs/ardour/ardour/plugin.h
+++ b/libs/ardour/ardour/plugin.h
@@ -177,6 +177,9 @@ public:
 	void realtime_locate (bool);
 	void monitoring_changed ();
 
+	virtual void add_slave (boost::shared_ptr<Plugin>, bool realtime) {}
+	virtual void remove_slave (boost::shared_ptr<Plugin>) {}
+
 	struct UILayoutHint {
 		UILayoutHint () : x0 (-1), x1 (-1), y0 (-1), y1 (-1), knob (false) { }
 		int  x0;
diff --git a/libs/ardour/ardour/plugin_insert.h b/libs/ardour/ardour/plugin_insert.h
index 569ed748a9..d1fa7e951e 100644
--- a/libs/ardour/ardour/plugin_insert.h
+++ b/libs/ardour/ardour/plugin_insert.h
@@ -421,6 +421,7 @@ private:
 
 	boost::shared_ptr<Plugin> plugin_factory (boost::shared_ptr<Plugin>);
 	void add_plugin (boost::shared_ptr<Plugin>);
+	void plugin_removed (boost::weak_ptr<Plugin>);
 
 	void add_sidechain_from_xml (const XMLNode& node, int version);
 
diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index 131892df5e..dc210a91a7 100644
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -3151,6 +3151,9 @@ PluginInsert::get_impulse_analysis_plugin()
 		ret->configure_io (internal_input_streams (), out);
 		ret->set_owner (_owner);
 		_impulseAnalysisPlugin = ret;
+
+		_plugins[0]->add_slave (ret, false);
+		ret->DropReferences.connect_same_thread (*this, boost::bind (&PluginInsert::plugin_removed, this, _impulseAnalysisPlugin));
 	} else {
 		ret = _impulseAnalysisPlugin.lock();
 	}
@@ -3212,6 +3215,21 @@ PluginInsert::add_plugin (boost::shared_ptr<Plugin> plugin)
 #endif
 
 	_plugins.push_back (plugin);
+
+	if (_plugins.size() > 1) {
+		_plugins[0]->add_slave (plugin, true);
+		plugin->DropReferences.connect_same_thread (*this, boost::bind (&PluginInsert::plugin_removed, this, boost::weak_ptr<Plugin> (plugin)));
+	}
+}
+
+void
+PluginInsert::plugin_removed (boost::weak_ptr<Plugin> wp)
+{
+	boost::shared_ptr<Plugin> plugin = wp.lock();
+	if (_plugins.size () == 0 || !plugin) {
+		return;
+	}
+	_plugins[0]->remove_slave (plugin);
 }
 
 void