diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index 08f8689c29..dc884d9b40 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -1342,6 +1342,7 @@ public:
 	bool bang_trigger_at(int32_t route_index, int32_t row_index, float velocity = 1.0);
 	bool unbang_trigger_at(int32_t route_index, int32_t row_index);
 	void clear_cue (int row_index);
+	std::shared_ptr<TriggerBox> armed_triggerbox () const;
 
 	void start_domain_bounce (Temporal::DomainBounceInfo&);
 	void finish_domain_bounce (Temporal::DomainBounceInfo&);
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index f85d234515..42c9f81c32 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -8197,3 +8197,20 @@ Session::have_external_connections_for_current_backend (bool tracks_only) const
 	}
 	return false;
 }
+
+std::shared_ptr<TriggerBox>
+Session::armed_triggerbox () const
+{
+	std::shared_ptr<TriggerBox> armed_tb;
+	std::shared_ptr<RouteList const> rl = routes.reader();
+
+	for (auto const & r : *rl) {
+		std::shared_ptr<TriggerBox> tb = r->triggerbox();
+		if (tb && tb->armed()) {
+			armed_tb = tb;
+			break;
+		}
+	}
+
+	return armed_tb;
+}