i discovered this last night while sampling a dj battle record, i had a break on loop and some scratch samples and stabs, i left the sample on loop and just hit reverse a bunch while turning slicer on and off while reversing and forwarding, it sounded real and cool .

Heh

DJFX Looper can be good too, although its a little hard to coordinate the controls finely

this technique can be used with dj fx llooper too .

it doesnt work with all samples tho, im still trying to figure out how to do bass scrathces and stuff. but i use some plugins to for fake scratching.

Sounds cool!
cut chemist, dj shadow and dj numark did a MPC show and scratchings on the mpc's with a mixer.