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)