Don't know if this helps any of you guys or not:

The Korg PA800/Pa2 allows you to set a velocity level 1-127, then use LH keyboard area to trigger one of these things if you reach that velocity:
(note: anything over about 115 takes a pretty hard hit to trigger)

1) Fill 1 or 2, or break
2) Start/Stop
3) Bass Inversion
4) Memory ( I use this a lot)

Also, something I use is that you can easily set up a sound ( multisample assigned to samples/ 4 osc per voice) (LH or RH or 1 or,2 or,3) to trigger at a certail velocity or higher. Works nice to bring in a sound on hard playing that adds a lot to the performance dynamics. I use it a lot for orchectial playing and bring in Bress or strings ensemble.

Other boards may have the same functions?

Lee