Yamaha DTXpress/DTXplorer/DTXtreme

Hi again,

I'm now playing with the QY and it works fine except from the fact 
that some midi messages are sent from the dtx to the QY and it's 
really weird. When I change the kit on the dtx, it also changes the 
sound on the QY! If anyone has an idea?

My question is now about the possibility of expanding the kit. What 
kind of pad are recommended for the 9/10 trigger? Are roland mesh head 
pad compatible? Can I put a 2 zone-pad or even a 3-zone one?

If you have references it would be perfect.

Thanks