Standing at PIN OAK LANE FARM P.O. Box 129, New Freedom, PA 17349-0129. Phones (717) 235-4954, (800) 346-8398. Fax (717) 235-8190. E-mail: bsolomon@cyberia.com www.pinoaklane.com SANTANA STRINGS, a six-year-old Florida-bred son of Wheaton, is a multiple stakes winner for the Millennium Farms's racing stable.  A precocious two-year-old who won in his first start at Arlington Park, Santana Strings counts the Grade 2 Amsterdam Stakes at Saratoga as the highlight of his career so far.  He also won the Alysheba Breeders' Cup Stakes at Lone Star Park and recently ran second to sprint star Benny the Bull in the Sunshine Millions Sprint at Gulfstream Park.  A sprinter by trade, he has won at five different racetracks and earned over $500,000.