Please remember that the layout is dictated by the "original" system. ie the DX6 was the XP662, the DX7 was the 2720, the DSX9 was the PCM9XII and the 12X 2.4 is based on the original current in service PCM12X as sold in Japan. The DX6i was designed from the "ground up" and therefore the CofG has been made at a different point.