* This code is supposed to duplicate the IBM firmware behaviour:
* - Pressing MUTE issues mute hotkey message, even when already mute
* - Pressing Volume up/down issues volume up/down hotkey messages,
* This code is supposed to duplicate the IBM firmware behaviour:
* - Pressing MUTE issues mute hotkey message, even when already mute
* - Pressing Volume up/down issues volume up/down hotkey messages,