help: linking two hardware samplers together via midi

Does anybody know how to connect 2 akai S2000 s together using midi so that each can be sequenced together using cubase. Ive got both hooked up on my mixing desk so i can hear them and i can sequence with one of them but not both together.

You gotta connect them seperatly to your computer, or use a midi merge box and merge the 2 signals to one.