Looking back at the documentation, you had posted in the other thread about being unable to find Preferences->Style Setup. If you look above that section, it indicates it only applies to these models: "Pa3X, Pa2X, Pa800, Pa500, Pa588, Pa1X". So it doesn't apply to your PA300. The section right above that one lists these models: "Pa4X, Pa3XLe, Pa900, Pa600, Pa300, HAVIAN 30". So that's the only section that applies to your keyboard. The Song ID Number applies to all models of course.
Mike
Mike