To change the articulation you need to identify which keyboard notes represent the different artics and to program them into the prv, just like a regular note.
All artic notes are designed so they don't overlap the playing range of the instrument in question, so you'll find the artics for basses at the top of the scale, whilst for piccolo's you'll find them at the bottom.
I have all of my artics routed via their own dedicated drum map. This makes it easy to identify & edit notes entirely separately from articulations