Yamaha DTXpress/DTXplorer/DTXtreme

Hello to all!!

I have been monitoring this group for several months now.  Very, 
very helpful.  This is my first post.

I have the standard DTXpress II components now but wish to add a 
Yamaha dual zoned cymbal, another Yamaha tom and the Yamaha bar pad, 
in that order of preference.  

Is there a configuration that will allow me to do all of this with 
one module?  If so, what connection configuration would I use.  If 
not, what is the limit to my plan and what connection configuration 
is necessary for that?

Thanks very much!!

Sean