Yamaha DTXpress/DTXplorer/DTXtreme

Recently been learning midi and since I have multiple modules, I was 
thinking about midi recording.

Would I have to send 'each' module to a separate midi track into my 
Cubase computer? Or can I link module #1's midi out into modules 
#2's midi in, then module #2's midi out to my sound card?

I'm wondering about playing back the recorded midi from my Cubase 
computer, back to the modules. I mean the Cubase drum editor has 
specific lines for each drum, cymbal etc...So I'm guessing that 
sending each module into the computer separately would be the way to 
do it...?

Btw, my main reason for multiple modules is obviosly to have a 
number of trigger pads to beat on for different sounds:)

Steve