http://jklabs.net/projects/visualscratch/

Literal [pixelsumo]:
Visual Scratch by Jesse Kriss is a realtime visualization of scratch DJ performance. Ms Pinky is used to get the velocity of the turntable into Max/MSP using a control record. Ms Pinky allows you to scratch an MP3, so the sound is routed out to the mixer, and then back into Max where volume & frequencies are analyzed. A second machine is used to output the Processing visuals. Jesse has previously created MaxLink, a method of communication between Max/MSP & Processing, used in the project Visual Scratch. [..+]

Video [.mov]