do this:
sample something, a vocal or something, that would be best i would think.
then of course place you sample to one key on the keyboard.
lets say c1.
(that is typically were i start my samples at for breaks, and it is now a habit)
then what you need to do is go into the mod matrix screen
(i love the instruction manual, what 500 pages and all it really says is " to turn on sampler push the power button, i will let you work the rest out)
once you are in the matrix mod you should go to the first chord. the one that has the velocity then amp then 24%
what you need to do is either disconnect that controller or set the percentage down to zero
or you could simply do what i am going to tell you to do on that patch chord section.
use the source as: VEL<
destination will be: 'SSTART
set your percentage at: -100%
now the magic starts. go to your sequencer and program a line that is a few measures long, say two, and what i want you to do is, oh say, use 32 notes, since you place the sample on c1, hit c1 over and over again, untill those two measures are full with notes. set a loop point just so you can hear it again and again
now you need to select that entire loop and set the velocity to gradually change from 127 (128) to 0 (1). so basically you should have it "fade" out. but since we disconnect the amp, you should get a steady signal.
now play the sequencer. what you should hear is the sample start at the begainning, stuttering, and slowly moving from one part to the next. so if you have a sample of "rock the beat" it will sound like:
rrrrroooooooccccccckkkkkk ttttttthhhhhhhheeeeeee bbbbbeeeeaaaaaaatttttt.
now if you increase the percentage value, what you will get is a much more delayed movement. once you hit 0 it will just stutter the start of the sample. so really you could have a word go on for an hour if you wanted.
now the bit about using the mod wheel, that is something i am sure you can use as well. try subing the VEL< source with the mod wheel and see what happens when you draw in the controller values. it should work just as well.
may have some kind of graining sound, but i think it is what you are looking for...