You have to ask Korg why. Personally I don’t care. I like this new Korg no matter how they call it. I mean that Roland, Korg and Yamaha brings their old technology in new products. That’s how they survive. They are no innovative anymore. Will I buy one no I already own a ek50 and my next purchase will be the pa700 in the next few months. But it is good news for all of us these new models. These Korgs are the best sounding arrangers in this price tag and force Casio and Yamaha and maby even Roland to come with better sounding arrangers.