Scratching vid of the 400 with Traktor Pro 2 Check it!
http://www.facebook.com/video/video.php?v=403884152962849 
Got this from the Vestax FB page, not my vid but good to show how well the 400 can scratch.
For scratch setting set the jog wheel to encoder and the sensitivity to 17% and acceleration to 3%. tension on the wheels about 75% loose. Works great for me!