+                       /** Audio class driver callback for the setting and retrieval of streaming endpoint properties. This callback must be implemented
+                        *  in the user application to handle property manipulations on streaming audio endpoints.
+                        *
+                        *  When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for
+                        *  the given endpoint index, and should return as fast as possible. When non-NULL, this value may be altered for GET operations
+                        *  to indicate the size of the retreived data.
+                        *
+                        *  \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value
+                        *        of the \c DataLength parameter.
+                        *
+                        *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
+                        *  \param[in]     EndpointProperty    Property of the endpoint to get or set, a value from \ref Audio_ClassRequests_t.
+                        *  \param[in]     EndpointAddress     Address of the streaming endpoint whose property is being referenced.
+                        *  \param[in]     EndpointControl     Parameter of the endpoint to get or set, a value from \ref Audio_EndpointControls_t.
+                        *  \param[in,out] DataLength          For SET operations, the length of the parameter data to set. For GET operations, the maximum
+                        *                                     length of the retrieved data. When NULL, the function should return whether the given property
+                        *                                     and parameter is valid for the requested endpoint without reading or modifying the Data buffer.
+                        *  \param[in,out] Data                Pointer to a location where the parameter data is stored for SET operations, or where
+                        *                                     the retrieved data is to be stored for GET operations.
+                        *
+                        *  \return Boolean true if the property get/set was successful, false otherwise
+                        */
+                       bool CALLBACK_Audio_Device_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
+                                                                         const uint8_t EndpointProperty,
+                                                                         const uint8_t EndpointAddress,
+                                                                         const uint8_t EndpointControl,
+                                                                         uint16_t* const DataLength,
+                                                                         uint8_t* Data);
+
+                       /** Audio class driver event for an Audio Stream start/stop change. This event fires each time the device receives a stream enable or
+                        *  disable control request from the host, to start and stop the audio stream. The current state of the stream can be determined by the
+                        *  State.InterfaceEnabled value inside the Audio interface structure passed as a parameter.
+                        *
+                        *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state.
+                        */
+                       void EVENT_Audio_Device_StreamStartStop(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);
+
+               /* Inline Functions: */