Hi to Dan -O, and all. I,m new to this forum and was wondering if someone can tell me what the difference is between the X3 and X4 ---sound wise that is . I have owned an x4 in the past but went to the x1 keyboard for a while . Now I want to go back to a smaller module as the x1 is a bit heavy for me . Is any out there using the X3, and if so can you please let me know what you think of the sounds and styles>. Many Thanks