I can forgive August Darnell the filler on side one because he's a gifted disco producer, which means his throwaway jingles and premature remakes and cynical trifles add up to dance music that's more listenable than most. But the failures on side two are as unfocused as anything he's ever committed to vinyl--excepting only "If I Only Had a Brain," an all too apt cover for these would-be bimbos. B