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diff --git a/usb/common/audio/AUDFeatureUnitDescriptor.h b/usb/common/audio/AUDFeatureUnitDescriptor.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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Class for manipulating USB %audio feature unit descriptor.
+///
+/// !!!Usage
+///
+/// -# Declare an AUDFeatureUnitDescriptor instance as part of the
+///    configuration descriptors returned by a USB %audio %device.
+//------------------------------------------------------------------------------
+
+#ifndef AUDFEATUREUNITDESCRIPTOR_H
+#define AUDFEATUREUNITDESCRIPTOR_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USB Audio Channel controls"
+///
+/// This page lists the available controls for each channel of the audio
+/// interface. Each channel can have any control combination; simply perform
+/// a bitwise OR ('|') to combine several values.
+/// 
+/// !Controls
+/// -# AUDFeatureUnitDescriptor_MUTE
+/// -# AUDFeatureUnitDescriptor_VOLUME
+/// -# AUDFeatureUnitDescriptor_BASS
+/// -# AUDFeatureUnitDescriptor_MID
+/// -# AUDFeatureUnitDescriptor_TREBLE
+
+/// Channel mute control.
+#define AUDFeatureUnitDescriptor_MUTE               (1 << 0)
+
+/// Channel volume control.
+#define AUDFeatureUnitDescriptor_VOLUME             (1 << 1)
+
+/// Channel bass control.
+#define AUDFeatureUnitDescriptor_BASS               (1 << 2)
+
+/// Channel middle control.
+#define AUDFeatureUnitDescriptor_MID                (1 << 3)
+
+/// Channel treble control.
+#define AUDFeatureUnitDescriptor_TREBLE             (1 << 4)
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+#ifdef __ICCARM__          // IAR
+#pragma pack(1)            // IAR
+#define __attribute__(...) // IAR
+#endif                     // IAR
+
+//------------------------------------------------------------------------------
+/// Describes available controls for each channel of the unit or terminal
+/// it is connected to. This type must be augmented with the relevant number
+/// of bmaControls fields and the iFeature field.
+//------------------------------------------------------------------------------
+typedef struct {
+
+    /// Size of descriptor in bytes.
+    unsigned char bLength;
+    /// Descriptor type (AUDGenericDescriptor_INTERFACE).
+    unsigned char bDescriptorType;
+    /// Descriptor subtype (AUDGenericDescriptor_FEATURE).
+    unsigned char bDescriptorSubType;
+    /// Identifier of this feature unit.
+    unsigned char bUnitID;
+    /// Identifier of the unit or terminal this feature unit is connected to.
+    unsigned char bSourceID;
+    /// Size in bytes of a channel controls field.
+    unsigned char bControlSize;
+
+} __attribute__ ((packed)) AUDFeatureUnitDescriptor; // GCC
+
+#ifdef __ICCARM__          // IAR
+#pragma pack()             // IAR
+#endif                     // IAR
+
+#endif //#ifndef AUDFEATUREUNITDESCRIPTOR_H
+