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diff --git a/arm-fm-22k/lib_src/eas_fmsynth.h b/arm-fm-22k/lib_src/eas_fmsynth.h
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+++ b/arm-fm-22k/lib_src/eas_fmsynth.h
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+/*----------------------------------------------------------------------------
+ *
+ * File:
+ * eas_fmsynth.h
+ *
+ * Contents and purpose:
+ * Implements the FM synthesizer functions.
+ *
+ * Copyright Sonic Network Inc. 2004
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *----------------------------------------------------------------------------
+ * Revision Control:
+ *   $Revision: 90 $
+ *   $Date: 2006-07-11 20:18:13 -0700 (Tue, 11 Jul 2006) $
+ *----------------------------------------------------------------------------
+*/
+
+#ifndef fmsynthH
+#define fmsynthH
+
+#include "eas_data.h"
+
+#if defined (_FM_SYNTH)
+
+/* FM envelope state */
+typedef enum {
+	eFMEnvelopeStateAttack = 0,
+	eFMEnvelopeStateDecay,
+	eFMEnvelopeStateSustain,
+	eFMEnvelopeStateRelease,
+	eFMEnvelopeStateMuted,
+	eFMEnvelopeStateInvalid			/* should never be in this state! */
+} E_FM_ENVELOPE_STATE;
+
+/*------------------------------------
+ * S_OPERATOR data structure
+ *------------------------------------
+*/
+typedef struct s_operator_tag
+{
+	EAS_I16		pitch;				/* operator pitch in cents */
+    EAS_U16		envGain;			/* envelope target */
+    EAS_I16		baseGain;			/* patch gain (inc. vel & key scale) */
+    EAS_U16		outputGain;			/* current output gain */
+    EAS_U16		envRate;			/* calculated envelope rate */
+    EAS_U8		envState;			/* envelope state */
+    EAS_U8		pad;				/* pad to 16-bits */
+} S_OPERATOR;
+#endif
+
+typedef struct s_fm_voice_tag
+{
+	S_OPERATOR			oper[4];		/* operator data */
+    EAS_I16				voiceGain;		/* LFO + channel parameters */
+	EAS_U16				lfoPhase;		/* LFO current phase */
+	EAS_I16				lfoValue;		/* LFO current value */
+	EAS_U16				lfoDelay;		/* keeps track of elapsed delay time */
+	EAS_I8				pan;			/* stereo pan value (-64 to +64) */
+	EAS_I8				pad;			/* reserved to maintain alignment */
+} S_FM_VOICE;
+
+#ifdef _FM_EDITOR
+extern S_FM_REGION newPatch;
+extern S_FM_REGION OriginalPatch;
+#endif
+
+extern EAS_U32 freqTable[];
+
+#endif