'Applies :param multiplier to self._delay_fmt
>>> d = AproxDelay(\'a@a.%sX!\', \'a\', 10)
>>> d.get_string_for_multiplier( 2 )
\'a@a.aaaaaaaaaaaaaaaaaaaaX!\''

def get_string_for_multiplier(self, multiplier):

    fmt_data = (((self._delay_char * self._char_reps) * multiplier) * self._base_multiplier)
    return (self._delay_fmt % fmt_data)
