Kip Bryan

I'm a first time user of Cakewalk and I have a Mio cable (usb to midi) which cakewalk recognizes. I'm not being able to make any connection to the Roland Piano 700 which is over 30 years old. Reading the cakewalk information makes a comment about downloading instrument for older instruments. I'm thinking this may be the problem, but I haven't been able to find these downloadable instruments. Does anyone know where I could find them, or is there another solution?