Yamaha DTXpress/DTXplorer/DTXtreme

I recently acquired a DTXpress and an MFC1 programmable MIDI
footswitch.  I have been able to change kits with the footswitch
(which is great), but I also want to pass the MIDI signal through the
DTXpress to go to an ART Pro-verb unit to change effects with the MIDI
footswitch as well.  The DTXpress does not have a MIDI  "though", just
"in" and "out".  How can I pass the MIDI info through the DTX to my
Pro-verb ?  Any help would be appreciated.

Thanks,

JC