Midi controller to Roland JV-80


Hi....I have a Roland JV-80 keyboard and the keyboard is way past it's prime (broken keys /bad key contacts) Every thing else works ( I replaced all the function tactile switches) and I would like to use it as basically a module..It would be connected to a Nektar GX61 controller..The Nektar has a USB type B out. I have a USB A to USB b adaptor. What would be the best way to go about this? Thanks......