Yamaha DTXpress/DTXplorer/DTXtreme

> i am planning to get the v-kick and v-snare from
> roland to add into my dtxpress set....
> are they compatible?

Unfortunately you will have to decrease the output of the Roland pads to match the sensitivity of the DTXpress.
You will get a 99% triggering on a low to medium strike of the v-pads.  No tweaking will cure it.  All yamaha pads have a potentiometer 
inside the pad to accommadate the lack of input sensitivity on the modules.  Once you do decrease the output with a 250k pot, you will 
enjoy a very responsive combination.  
Jun