This very nicely done demo video is for the Electro-Harmonix Riddle - an envelope filter fine-tuned for guitar frequency response.
In the video, Jack Conte does a great job of both demonstrating the range of the Riddle and exploring it within a musical context.
Here's the rundown on the Riddle's features:
A small 3 channel mixer built for the road
Separate audio into separate tracks and groove away
Highly flexible amp sim, and many other tweaks for latest version