i like this man u definately got it sounding eerie - real chiller track, vocal sounds good mix aint that bad to say it was done on laptop,
answer to ya question:
i use cubase sx / kontakt2, i chop up in recycle as much as i can of the track, when im slicing i go for as many different sounds as i can get, trying to get as many diff pitch changes as possible in the slices so i have a good scale of keys, also any weird/interesting noises that stick out
i put the rex file into kontakt sometimes about 4 layers of the same one with diff pitch on each one
to get it fast i just knock the pitch up/tuning in kontakt. Usually I speed up a long loop of the sample until it fits with the beat and plays back fast and on beat, if it doesnt fit i go back and mess with the tuning or do it on the fly, like DJing/beatmatching. Sometimes i use the time machine in kontakt when i dont wanna alter pitch.
then i draw the blocks in on the sequencer and change velocities/ how long each note is played etc. I've got an akai mpd trigger thing but i only really use it to get a feel of what im doing most of the time i'm drawing in with the mouse. I quantize my shit and add swing and then take snap off and move each note till i got it exactly where i want it.
nice one