diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index c833978175..85623a3077 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -832,8 +832,6 @@ public:
 	bool loop_is_possible () const;
 	PBD::Signal0<void> PunchLoopConstraintChange;
 
-	// Temporal::TempoMap&       tempo_map()       { *Temporal::TempoMap::fetch(); }
-	// const Temporal::TempoMap& tempo_map() const { return *Temporal::TempoMap::fetch(); }
 	void maybe_update_tempo_from_midiclock_tempo (float bpm);
 
 	unsigned int    get_xrun_count () const {return _xrun_count; }
diff --git a/libs/ardour/ardour/triggerbox.h b/libs/ardour/ardour/triggerbox.h
index d755f080fd..7a2170960d 100644
--- a/libs/ardour/ardour/triggerbox.h
+++ b/libs/ardour/ardour/triggerbox.h
@@ -341,6 +341,9 @@ class LIBARDOUR_API TriggerBox : public Processor
 	void note_on (int note_number, int velocity);
 	void note_off (int note_number, int velocity);
 
+	void reconnect_to_default ();
+	void parameter_changed (std::string const &);
+
 	typedef std::map<uint8_t,Triggers::size_type> MidiTriggerMap;
 	MidiTriggerMap midi_trigger_map;
 
diff --git a/libs/ardour/triggerbox.cc b/libs/ardour/triggerbox.cc
index b5da9b0ff3..ce330add31 100644
--- a/libs/ardour/triggerbox.cc
+++ b/libs/ardour/triggerbox.cc
@@ -944,6 +944,8 @@ TriggerBox::TriggerBox (Session& s, DataType dt)
 	midi_trigger_map.insert (midi_trigger_map.end(), std::make_pair (uint8_t (36), 7));
 
 	Temporal::TempoMap::MapChanged.connect_same_thread (tempo_map_connection, boost::bind (&TriggerBox::tempo_map_change, this));
+
+	Config->ParameterChanged.connect_same_thread (*this, boost::bind (&TriggerBox::parameter_changed, this, _1));
 }
 
 void
@@ -1678,3 +1680,22 @@ TriggerBox::tempo_map_change ()
 		t->tempo_map_change ();
 	}
 }
+
+void
+TriggerBox::parameter_changed (std::string const & param)
+{
+	if (param == X_("default-trigger-input-port")) {
+		reconnect_to_default ();
+	}
+}
+
+void
+TriggerBox::reconnect_to_default ()
+{
+	if (!_sidechain) {
+		return;
+	}
+
+	_sidechain->input()->nth (0)->disconnect_all ();
+	_sidechain->input()->nth (0)->connect (Config->get_default_trigger_input_port());
+}