Integrating keytation pro into set up

I was using an MPC 1k with my roland keyboard (a few not so good sounds but i used them sometimes) and Reason as a sound module and with that set up i could play Reasons notes with both my keyboard and my MPC. I only have 1 midi in and 1 out in the roland keys and 1 midi in 1 out in my soundcard. both midi ins and outs in the MPC are used, 1 for the keyboard and 1 for my soundcard. I have just bought a keystation pro 88 and i dont know how to intergrate it with my old set up. Im currently just using it with Reason but want to use it like my previous set up. Do i need to buy a midi man or something if i dont have enough midi space left and if so are all the 1s i see are usb wich i dont need. Sorry for the long post guys, thanx a million for any help.