I caught Scratch on Pitchfork TV this week. Pretty much every DJ cited GrandMixer DXT and "Rockit" as their original inspiration. Usually I would want to A/B the source and the transformation—DXT is mixing some record—but here it seems besides the point: the original has been obscured beyond recognition
On the other hand, here's another track mentioned in the movie whose purpose is to call specific attention to traditional DJ source material.