'Initialize the NAD Receiver device.'

def __init__(self, name, nad_receiver, min_volume, max_volume, source_dict):

    self._name = name
    self._nad_receiver = nad_receiver
    self._min_volume = min_volume
    self._max_volume = max_volume
    self._source_dict = source_dict
    self._reverse_mapping = {value: key for (key, value) in self._source_dict.items()}
    self._volume = self._state = self._mute = self._source = None
