Emu XL-7 & MP-7 User's Group

Hi all, 

I just bought an Mp-7 from Ebay the last week and it works fine (I like the sound and features are really easy), but I've a problem with my midi configuration, so I need some help.
I use the mp-7 with an Mpc2kxl and a midi keyboard, but I don't know how to use the both in a same time: The MPC2kxl is the master sequencer, so I plug the Mpc midi out port in the "in" port of the Mp7, but I would to plug my keyboard on the Mp7 to play with in the same time, and here I can only switch between cables cause I did'nt find another solution.
I think to buy a midi interface, but I don't know if it's the good answer. I don't use computer (only for e-loader/prodatum backup), so please give me a solution without it.
Someone can help me please.

Regards.