So I want a digital piano with good piano feel and sounds. I been thinking kurzweil sp-8x or something. Well is it possible to get a card or some easy way of putting killer b3 and ep sounds onto this particular keyboard or pretty much any good keyboard. In fact, any good keyboard with good feel and piano sounds that I can expand that can be recommended is most appretciated. By the way, I already have the roland expansion card 'Keyboards of the 60' and 70's' but they are different brands so I dont know if they are compatible.