Yamaha DTXpress/DTXplorer/DTXtreme

hello from CT!
if someone would please help me; i'm stumped.
I've just added the Midiman 2x2 so I can track both my Roland s-10
MIDI-controlling kybrd (w/a KORG X5DR sound module) and DTXpress.
here's what i've got:
MIDI out from the s-10 into the snd module.
out from the module into in-A of the 2x2.

SEA: Nope.. MIDI out should go to one of the MIDI in's of your Midiman
interface.

out-A of the 2x2 into s-10 kybrd.

SEA: Correct, you should have a MIDI thru connection left on the S-10, this
goes to the MIDI in of the X5 module.

DTXpress out to in-B of 2x2.
out-B of 2x2 into DTXpress.

SEA: Again this is correct.

what am i doing wrong?
i chose the ports in PA9.
do i need to set something in the DTXpress? For example, MIDI
functions in the sound module only in GLOBAL MULTI mode. (what does
THAT mean anyway??!)

SEA: Can you be more specific? Are you talking about the DTX here, as I can
not find this in my manual.