Unfortunately, the Synthstation API software is incompatible with iOS 5. Akai have just released a new version compatible with iOS 5, but too late to be included in Fairlight App 1.1.7. It is fixed in 1.1.8, which was submitted to the App Store on 13th of November 2011.
Posted in: Bugs fixed in 1.1.8 to 1.1.11