Yamaha DTXpress/DTXplorer/DTXtreme

I am new to the group and also new to edrums. I have purchased 2 
pintechs to add to my current setup and also an alesis dm5 mod. I 
have been told that I can connect the dtxpressII mod and the alesis 
to work as one system, however it is better to use the xpress for 
all cymbals  and the alesis for drum pads. I am not very good with 
this process and wondreed if anyone could give a hand in the 
connection process. 

Thanks 
Doug