From 2111cfe5574b5054cd060cf2aac2e1579913069d Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Fri, 17 Dec 2021 19:22:44 -0700
Subject: [PATCH] triggerbox: allow set_region_threaded() to "unset" the region

---
 libs/ardour/triggerbox.cc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/libs/ardour/triggerbox.cc b/libs/ardour/triggerbox.cc
index 73ada2bbdb..99827c240b 100644
--- a/libs/ardour/triggerbox.cc
+++ b/libs/ardour/triggerbox.cc
@@ -745,15 +745,21 @@ AudioTrigger::natural_length() const
 int
 AudioTrigger::set_region_threaded (boost::shared_ptr<Region> r)
 {
-	using namespace RubberBand;
+	assert (!active());
 
 	boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion> (r);
 
-	if (!ar) {
+	if (r && !ar) {
 		return -1;
 	}
 
 	set_region_internal (r);
+
+	if (!r) {
+		/* unset */
+		return 0;
+	}
+
 	load_data (ar);
 	determine_tempo ();
 	setup_stretcher ();