Yamaha DTXpress/DTXplorer/DTXtreme

Has anyone been able to control ALL the parameters of the DTXpress 
from within VST? I'm trying to make a mixermap so I can, for example, 
change the volume of ONLY the snare drum, or add more reverb to the 
cobell, etc.. I am able to change and control the sound of the drum 
kits as a whole, such as "main volume", but I can't figure out how 
manipulate the sounds individually. If anyone has any knowledge that 
they wouldn't mind sharing, I will be greatful.

Thanks in advance,
Dave Collett