+ * - The definition of the Audio class \ref USB_Audio_Descriptor_Format_t has been altered, to remove the fixed singular
+ * audio sample rate in the descriptor definition, and to rename the \c SampleFrequencyType to the more appropriate
+ * \c TotalDiscreteSampleRates. Existing applications will need to add an array of \ref USB_Audio_SampleFreq_t elements
+ * immediately following any \ref USB_Audio_Descriptor_Format_t descriptors, and insert the appropriate sampling rates
+ * supported by the device, as well as rename the descriptor elements to match the updated element names.
+ * - The device mode Audio class driver now requires a new user application callback, \ref CALLBACK_Audio_Device_GetSetEndpointProperty().
+ * Existing applications must implement this new callback, however if multiple sample rates or pitch control is not used,
+ * this function may be hard-coded to always return false for previous behaviour to be retained.
+ * - The \c USB_ConfigurationNumber, \c USB_RemoteWakeupEnabled and \c USB_CurrentlySelfPowered globals have been renamed to
+ * \ref USB_Device_ConfigurationNumber, \ref USB_Device_RemoteWakeupEnabled and \ref USB_Device_CurrentlySelfPowered to clearly indicate
+ * the USB mode they relate to. Existing applications using these variables should rename all references to the previous names.
+ * - The \c ENDPOINT_DESCRIPTOR_DIR_IN and \c ENDPOINT_DESCRIPTOR_DIR_OUT macros have now been replaced by \ref ENDPOINT_DIR_IN and
+ * \ref ENDPOINT_DIR_OUT to improve code clarity.
+ * - The \ref HID_DESCRIPTOR_JOYSTICK() macro now takes an additional (first) parameter indicating the number of axis in the joystick.