Hi, the wha wha can be assigned to the volume pedal in the X1 also.

Frankieve, I didn't heard the SD1 yet but I can tell you my point of view starting from the X1. I heard the va-7 and I tried it next to the X1, and after two hours of comparing the two instruments, the X1 was a big winner. For the psr9000 pro, I didn't heard it but from what I've seen over the net, it seems the 9000 pro has little additions to the 9000 and that for the sounds, while the SD1 seems to be a new keyboard with new sounds, styles and new functions, I advise you to wait more time until the SD1 will come out.

Sorry for answering you before Dan does