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diff --git a/backends/midi/mt32/tables.h b/backends/midi/mt32/tables.h
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+/* Copyright (c) 2003-2004 Various contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef MT32EMU_TABLES_H
+#define MT32EMU_TABLES_H
+
+// Mathematical constants
+#ifndef PI
+#define PI 3.1415926535897932384626433832795
+#endif
+#ifndef LN
+#define LN 2.30258509
+#endif
+
+// Filter settings
+#define FILTERGRAN 512
+
+#define MIDDLEC 60
+
+#define NUMNOTES 128 // MIDI supports 128 notes/keys
+
+// Amplitude of waveform generator
+#define WGAMP (7168)
+//#define WGAMP (8192)
+
+namespace MT32Emu {
+
+class Synth;
+
+extern Bit16s smallnoise[MAX_SAMPLE_OUTPUT];
+
+// Some optimization stuff
+extern Bit32s keytable[217];
+extern Bit32s divtable[NUMNOTES];
+extern Bit32s smalldivtable[NUMNOTES];
+extern Bit32u wavtabler[54][NUMNOTES];
+extern Bit32u looptabler[9][10][NUMNOTES];
+extern Bit16s sintable[65536];
+extern Bit32u lfotable[101];
+extern Bit32s penvtable[16][101];
+extern Bit32s filveltable[128][101];
+extern Bit32s veltkeytable[5][128];
+extern Bit32s pulsetable[101];
+extern Bit32s sawtable[NUMNOTES][101];
+extern Bit32s ampbiastable[13][128];
+extern Bit32s fbiastable[15][128];
+extern float filtcoeff[FILTERGRAN][31][8];
+extern Bit32s finetable[201];
+extern Bit32u lfoptable[101][101];
+extern Bit32s ampveltable[128][64];
+extern Bit32s pwveltable[15][128];
+extern Bit32s envtimetable[101];
+extern Bit32s decaytimetable[101];
+extern Bit32s lasttimetable[101];
+extern Bit32s voltable[128];
+extern float ResonInv[31];
+
+extern Bit16s freqtable[NUMNOTES];
+extern Bit32s fildeptable[5][NUMNOTES];
+extern Bit32s timekeytable[5][NUMNOTES];
+extern int filttable[2][NUMNOTES][201];
+extern int nfilttable[NUMNOTES][101][101];
+
+extern const Bit8s LoopPatterns[9][10];
+
+extern Bit16s *waveforms[4][NUMNOTES];
+extern Bit32u waveformsize[4][NUMNOTES];
+
+class TableInitialiser {
+	void initMT32ConstantTables(Synth *synth);
+	void initWave(Synth *synth, File *file, bool reading, bool writing, int f, float freq, float rate, double ampsize, Bit32s div);
+	void initNotes(Synth *synth, sampleFormat pcms[54], float rate);
+public:
+	void initMT32Tables(Synth *synth, sampleFormat pcms[54], float sampleRate);
+};
+
+}
+
+#endif