From ce70b544b0735f8a1abe8226c6809d54a42e4c1b Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Thu, 28 Aug 2025 18:09:45 +0200
Subject: [PATCH] RTA: render master-bus first

---
 gtk2_ardour/rta_manager.cc | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/gtk2_ardour/rta_manager.cc b/gtk2_ardour/rta_manager.cc
index 2c37b95ef5..09a97cff8a 100644
--- a/gtk2_ardour/rta_manager.cc
+++ b/gtk2_ardour/rta_manager.cc
@@ -172,15 +172,23 @@ RTAManager::attach (std::shared_ptr<ARDOUR::Route> route)
 			return;
 		}
 	}
+	std::list<RTA>::iterator i;
 	try {
-		_rta.emplace_back (route);
+		/* render master first (as background) because it is the sum of other individual channels */
+		if (route->is_master ()) {
+			_rta.emplace_front (route);
+			i = _rta.begin();
+		} else {
+			_rta.emplace_back (route);
+			i = --_rta.end();
+		}
 	} catch (...) {
 		return;
 	}
 
-	_rta.back ().set_rta_speed (_speed);
-	_rta.back ().set_rta_warp (_warp);
-	_rta.back ().delivery ()->set_analysis_active (_active);
+	i->set_rta_speed (_speed);
+	i->set_rta_warp (_warp);
+	i->delivery ()->set_analysis_active (_active);
 
 	route->gui_changed ("rta", this); /* EMIT SIGNAL */
 	route->DropReferences.connect (*this, invalidator (*this), std::bind (&RTAManager::route_removed, this, std::weak_ptr<Route> (route)), gui_context ());