Yamaha DTXpress/DTXplorer/DTXtreme

I am contemplating the DTXpress kit and was wondering if the module 
uses multi-velocity sampling for more realistic playback?

I tried the kit last night and it responded only with a single sample 
per strike, no matter how hard or soft you hit the pads. Obviously 
the volume changes, but I'm looking for a change in sound due to 
multi-velocity sampling, like the Roland kits have.

I've always preferred Yamaha over Roland and so this is why I am 
looking at the DTXpress rather than the V-Club.

I'll probably still get the DTXpress even if it is not multi-
velocity :-)

Thanks for any help
Ian