EXS 24 Logic Sampler Users Group

I just bought exs24 this weekend, and it's awesome.  I'm wanting 
to make a free sample set of my Fender Rhodes because all of 
the Rhodes sounds out there are really lacking.  Particularly the 
EVP88, which doesn't even resemble a Rhodes.

How can I add a sample of its unique aftertouch into the mix.  I've 
heard you can do some environment mapping to pull this off?  
Could someone who knows please provide a walkthough?  I'll 
post the rhodes sample set up soon!

Thanks!
Brent