EXS 24 Logic Sampler Users Group

hi,
Several sample cds come these days with the idea
that you should crossfade between two samples
by using the mod wheel. That is : as you move the
modwheel up you fade out one sample and fade in the other.
Ive tried the manual etc and cant see how to do this with exs24.
Is this possible with exs24 or do I have to go back
to my akai s3000 to use this effect.
Help appreciated!
Bill