After soaring to nearly a four-year high in September, monthly production of Fannie Mae, Freddie Mac and Ginnie Mae MBS starting coming to earth in October. The three agencies issued a total of $146.68 billion of single-family MBS last month, down 8.8 percent from September. Even with the downturn, October still ranked as the second-highest monthly issuance since June 2013. Year-to-date production edged...[Includes two data tables]