Yamaha DTXpress/DTXplorer/DTXtreme

Hello, I am learning more every time I sit down behind this drumset. I 
also seem to have new questions each time.  I am trying to toy with 
different recordings, which leads me to this question: How can I 
record 1 track of a song with 1 drumset and record the second track 
with a second drumset? What I am trying to do is lay the first track 
down with a pretty standard jazz setup and the second track with a 
vibraphone voicing so I can play different notes over the original 
beat. Thanks in advance!