EXS 24 Logic Sampler Users Group

I just got the EastWest "Voices of the Apocalypse" and did the conversion from 
Giga to EXS24.  A few of the sounds have a feature where you can assign 
different attacks to the mod wheel.  The problem is....  I cna't figure out how to 
do this!  I've read the manual and searched online, but to no avail.

I'm using a Korg T1 as a controller (joystick instead of mod wheel) -- can 
anyone explain how I would assign the attacks on these voices, or the various 
vocal sounds (for example, it might be mens choir ooh-eh and you assign 
each to the mod wheel) to my joystick?  These aren't key-switchable sounds 
or attacks, so the joystick is my only option!

Thanks a mil,

Kerry Muzzey