Connecting multiple midi devices, help please.

[kindsounds]

In order to get the fun stuff out of the way,
Mac Pro w/ 5 G RAM
Pro Tools HD v.7.3 latest update.
LaCie BigDisk 1T
Command 8
Keystation 88
Simmons SD7K

Okay, I just purchased the Simmons elec. set and want to add it to the mix. When I connect via usb, it kicks the Keystation 88 out. Pro Tools still sees the keystation in the audio midi setup/ midi devices window, yet changed the pic to the back of the drum module in the Keystation 88 box and will not highlight when I click on it.

I would like to be able to use both midi devices, not simultaneously, yet without having to fuss. What can I do to get these to work together.

Do I need a midi i/o???

[ronjazz]

You may well need something like the Midiman Midisport 2 x 2,a USB midi box, which should help you to ge the drums talking to Protools. I could be wrong, but that's the way my system works with multiple MIDI devices.