- hopefully fixed the MUS precaching for good.

According to blzut3, it looks like it is a byte followed by a variable length field. It can be any value 0-15 and will be followed by that many bytes one for each bank used. If the bank count is 0 then it is shorthand for using one bank (bank 0).

src/sound/music_mus_midiout.cpp

@@ -228,19 +228,19 @@ void MUSSong2::Precache()
 			val = instr - 100 + (1 << 14);
 		}
 
-		BYTE moreparam = used[k++];
-		if (moreparam == 1)
+		int numbanks = used[k++];
+		if (numbanks > 0)
 		{
-			BYTE bank = used[k++];
-			val |= (bank << 7);
-		}
-		else if (moreparam > 0)
+			for (int b = 0; b < numbanks; b++)
 			{
-			// No information if this is even valid. Print a message so it can be investigated later
-			Printf("Unknown instrument data found in music\n");
+				work[j++] = val | used[k++];
 			}
+		}
+		else
+		{
 			work[j++] = val;
 		}
+	}
 	MIDI->PrecacheInstruments(&work[0], j);
 }