'Get mute state.
:class:`True` if muted, :class:`False` unmuted, :class:`None` if
unknown.'

def get_mute(self):

    if (self._mixer is None):
        return None
    with _mixer_error_handling(self._mixer):
        mute = self._mixer.get_mute().get()
        ((mute is None) or validation.check_instance(mute, bool))
        return mute
    return None
