There's a "sequencer kit" download for the S90 ES for Cubase and Logic on the Yamaha-Europe site - see link below. The page is in german, but the Logic file should work. Can't verify, as I only have the S90. Good Luck.
http://www.yamaha-europe.com/yamaha_europe/download/products/10_musical_instruments/synthesizer/synthesizer/S90_ES/index.php?country=english_master