'iBooks won\'t accept PDFs through the automation interface (11.0.4), not sure
when that became a problem. If we\'re directly connected to the iDevice,
remove PDF from list of supported formats.'

def settings(self):

    if self.verbose:
        logger().info(('%s.settings()' % self.__class__.__name__))
    if self.manual_sync_mode:
        opts = super(ITUNES, self).settings()
        if ('pdf' in opts.format_map):
            opts.format_map.remove('pdf')
        return opts
    else:
        return super(ITUNES, self).settings()
