diff --git a/libs/ardour/ardour/triggerbox.h b/libs/ardour/ardour/triggerbox.h
index e274f18299..d153730f83 100644
--- a/libs/ardour/ardour/triggerbox.h
+++ b/libs/ardour/ardour/triggerbox.h
@@ -800,6 +800,8 @@ class LIBARDOUR_API TriggerBox : public Processor
 
 	static PBD::PropertyChange all_trigger_props();
 
+	void dump (std::ostream &) const;
+
   private:
 	struct Requests {
 		std::atomic<bool> stop_all;
diff --git a/libs/ardour/triggerbox.cc b/libs/ardour/triggerbox.cc
index 5a16bf2869..9e387c9648 100644
--- a/libs/ardour/triggerbox.cc
+++ b/libs/ardour/triggerbox.cc
@@ -4316,6 +4316,15 @@ TriggerBox::non_realtime_locate (samplepos_t now)
 	fast_forward (_session.cue_events(), now);
 }
 
+void
+TriggerBox::dump (std::ostream & ostr) const
+{
+	ostr << "TriggerBox " << order() << std::endl;
+	for (auto const & t : all_triggers) {
+		ostr << "\tTrigger " << t->index() << " state " << enum_2_string (t->state()) << std::endl;
+	}
+}
+
 /* Thread */
 
 MultiAllocSingleReleasePool* TriggerBoxThread::Request::pool = 0;