From 4b8d3c6c6b1403616b1501f3559fd96223f79728 Mon Sep 17 00:00:00 2001
From: OV2 <OV2@sessionclan.de>
Date: Sun, 6 Nov 2022 02:11:37 +0100
Subject: [PATCH] msu1: revert to start for invalid loop positions (#778)

---
 msu1.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/msu1.cpp b/msu1.cpp
index f6e545ea..71cb0878 100644
--- a/msu1.cpp
+++ b/msu1.cpp
@@ -253,7 +253,14 @@ void S9xMSU1Generate(size_t sample_count)
 			{
 				if (MSU1.MSU1_STATUS & AudioRepeating)
 				{
-					MSU1.MSU1_AUDIO_POS = audioLoopPos;
+					if (audioLoopPos < MSU1.MSU1_AUDIO_POS)
+					{
+						MSU1.MSU1_AUDIO_POS = audioLoopPos;
+					}
+					else // if the loop point is invalid, revert to start
+					{
+						MSU1.MSU1_AUDIO_POS = 8;
+					}
 					REVERT_STREAM(audioStream, MSU1.MSU1_AUDIO_POS, 0);
 				}
 				else