Firepod + Mackie Universal + Motif Es8 Hookup? Options

[braindog]

Hi guys, I just picked up a Firebox and Mackie Control Universal. I'm trying to hook everything together with a Yamaha Motif ES8 and G5 running Logic.
I'm confused where the MIDI cables go. Right now, this is how things are hooked up:

Firebox MIDI in/out cables <---> Mackie
Motif ES8 outputs TRS<--->TRS Firebox in

This can't be right, because it seems that the midi cables on the MOTIF need to be in the mix somehow. Do I need an AIEB2 board for the Motif?
What do I do?

Any help would be greatly appreciated!