From 515c0687b451b89408e69d2adc3579c2845f28fa Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Mon, 17 Apr 2017 20:34:18 +0200
Subject: [PATCH] amend 649b9e92f, backport MB code

---
 libs/ardour/route.cc | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index 42731d39f5..765a62e3fd 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -3568,13 +3568,16 @@ Route::roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame, in
 		return 0;
 	}
 
-	if (n_outputs().n_total() == 0) {
-		return 0;
-	}
+	//MB has its own signal path, regardless of I/O -- TODO handle !active for tracks & aux-busses)
+	if (!Profile->get_mixbus()) {
+		if (n_outputs().n_total() == 0) {
+			return 0;
+		}
 
-	if (!_active || n_inputs().n_total() == 0) {
-		silence_unlocked (nframes);
-		return 0;
+		if (!_active || n_inputs().n_total() == 0) {
+			silence_unlocked (nframes);
+			return 0;
+		}
 	}
 
 	framepos_t unused = 0;