johnny greenwood using maxmsp

a short little video of radiohead's johnny greenwood being all "crazy" and using maxmsp to process his guitar playing in a live performance.
It sounds like the software is sampling the signal from his guitar and chopping it into sections and then jumping around within these samples and repeating some of them to produce a kind of stuttering effect. Its obviously kept in time with the drums (drummer may be playing to a click track) to ensure that the loops and slices are in time.

The principles of the patch are not that complex, but to create a patch that can be used easily and reliably takes quite a bit of thought.