I hate when keyboard makers do this. They have a great machine like the pa1xpro which allows for expansion cards. I have waited patiently for more expansion cards to come out--especially a good multi-layer piano. The concert grand card is a joke. Then waht do they do? They make the PA800 with a good piano but will they offer it to PA1xpro users as an expansion card? Probably not, because they want us to buy the new machine. Am I wrong? Has anyone heard that this will be available soon? Why have there been no more expansion cards offering good sounds to add to my machine?