EXS 24 Logic Sampler Users Group

hello list members..
 does anyone know if its possible to set up logic/exs so that i can 
alter sample start times via CC, or something like that? id like to 
be able to quickly and easily try different start times on loop 
samples and im having a pretty horrible time trying to figure out 
some way to do this without it taking forever. any clues to help 
speed up this laborious process would be very welcome..

thanks

andy