Yes ...they have used the X1 case .
But the inside is different .
SD1 sound engine ...specs say 24 megs of sound rom .
The SD1 is 48 megs . You can load up to 50 patterns .
The Biggest difference between the X1 vs. XD9 will be how you navigate it !
The XD9 will have more screen dependency vs. the X1 . If you notice ...no style list like the X1 . This navigation will appeal to japanese end users IMHO .
Another BIG improvement over the X1 will be the drums ! The .wav files ( live drums) are the best I have heard ! dano