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diff --git a/usb/device/composite/AUDDFunctionDriver.h b/usb/device/composite/AUDDFunctionDriver.h
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+++ b/usb/device/composite/AUDDFunctionDriver.h
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+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef AUDDFUNCTIONDRIVER_H
+#define AUDDFUNCTIONDRIVER_H
+
+//-----------------------------------------------------------------------------
+//         Headers
+//-----------------------------------------------------------------------------
+
+#include <usb/common/core/USBGenericRequest.h>
+#include <usb/device/core/USBD.h>
+
+//-----------------------------------------------------------------------------
+//         Definitions
+//-----------------------------------------------------------------------------
+
+/// Sample rate in Hz.
+#define AUDD_SAMPLERATE        48000
+/// Number of channels in audio stream.
+#define AUDD_NUMCHANNELS       2
+/// Number of bytes in one sample.
+#define AUDD_BYTESPERSAMPLE    2
+/// Number of bits in one sample.
+#define AUDD_BITSPERSAMPLE     (AUDD_BYTESPERSAMPLE * 8)
+/// Number of samples in one USB subframe.
+#define AUDD_BYTESPERSUBFRAME  (AUDD_NUMCHANNELS * AUDD_BYTESPERSAMPLE)
+/// Number of samples in one USB frame.
+#define AUDD_SAMPLESPERFRAME   (AUDD_SAMPLERATE / 1000 * AUDD_NUMCHANNELS)
+/// Number of bytes in one USB frame.
+#define AUDD_BYTESPERFRAME     (AUDD_SAMPLESPERFRAME * AUDD_BYTESPERSAMPLE)
+/// Master channel.
+#define AUDD_MASTERCHANNEL     0
+/// Front left channel.
+#define AUDD_LEFTCHANNEL       1
+/// Front right channel.
+#define AUDD_RIGHTCHANNEL      2
+
+//-----------------------------------------------------------------------------
+//         Structs
+//-----------------------------------------------------------------------------
+
+/// AUDIO Speaker channel struct
+typedef struct {
+
+    unsigned char number;
+    unsigned char muted;
+
+} AUDDSpeakerChannel;
+
+//-----------------------------------------------------------------------------
+//         Callbacks
+//-----------------------------------------------------------------------------
+extern void AUDDSpeakerChannel_MuteChanged(AUDDSpeakerChannel *channel,
+                                           unsigned char muted);
+
+extern void AUDDFunctionCallbacks_InterfaceSettingChanged(
+    unsigned char interface,
+    unsigned char setting);
+
+
+//-----------------------------------------------------------------------------
+//         Exported functions
+//-----------------------------------------------------------------------------
+
+//- Function API For composite device
+extern void AUDDFunctionDriver_Initialize();
+
+extern unsigned char AUDDFunctionDriver_RequestHandler(
+    const USBGenericRequest * request);
+
+//- AUDIO Speaker API
+extern unsigned char AUDDSpeakerDriver_Read(void *buffer,
+                                            unsigned int length,
+                                            TransferCallback callback,
+                                            void *argument);
+
+#endif // #define AUDDFUNCTIONDRIVER_H
+