I recently P/U some DVDs of the old RED SLELTON show , at wal-mart . They play fine , but when I try to back them up , there is no sound , during the show itself. (MONO ?) The music plays , before the show starts , but there is no sound during the show. Tried several different computers , and burners , with the same result. Also , 4 different red skelton discs. Am using the latest versions of Decrypter , and shrink.