EXS 24 Logic Sampler Users Group

Hey,
I would like to know if it is possible to merge two or more instruments in
to one.
I've looked in the manual but I can't find anything. I have converted the
ultimate piano collection for Akai. I would like to merge the soft dynamic
piano (vel 0-89) with the loud one vel (90-127). Or is there a way to play
two tracks in the EXS at once.
Any one?

Mardyk