Yamaha DTXpress/DTXplorer/DTXtreme

i would really like to know more about that matter. is there a way 
that only you hear the click in the phones but not through a PA when 
you hook the dtxpress up through the line out plugs? 
how do you get a nice general mix between all your drums and 
cymbals. it sounds to me like the snare is not really loud enough 
even though i turned it all the way up to 127 and the bass drum 
aswell.
and tell me about any live situations where anyone has used just the 
dtexpress as the drumset! thanks a lot