From 1316120fe4ebf2ce47e6ebe595d20cd10901602d Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <c.oelckers@zdoom.fake>
Date: Thu, 31 Dec 2015 14:35:34 +0100
Subject: [PATCH] - fixed: The MUS precacher did not handle invalid patches
 well. - increased the valid range of patch values for MUS. According to the
 original MIDI2MUS code it can handle numbers up to 188, not 181, and at least
 one track from Eternal Doom uses #183.

---
 src/sound/music_mus_midiout.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/sound/music_mus_midiout.cpp b/src/sound/music_mus_midiout.cpp
index 1ebaa2eb4..eaf7e4afb 100644
--- a/src/sound/music_mus_midiout.cpp
+++ b/src/sound/music_mus_midiout.cpp
@@ -223,10 +223,17 @@ void MUSSong2::Precache()
 		{
 			val = instr;
 		}
-		else if (instr >= 135 && instr <= 181)
+		else if (instr >= 135 && instr <= 188)
 		{ // Percussions are 100-based, not 128-based, eh?
 			val = instr - 100 + (1 << 14);
 		}
+		else
+		{
+			// skip it.
+			val = used[k++];
+			k += val;
+			continue;
+		}
 
 		int numbanks = used[k++];
 		if (numbanks > 0)