From an article on FOHOnline.com about Ed's 'Divide' World Tour:
The Chewie II is a complete new creation based on Ed’s original Chewie Monsta loop pedal. The pedal that Ed uses onstage is a remote control for a larger system that sits under the stage.
“With this remote, Ed can record, play and stop the loops, and select which tracks to record onto, which are a mixture of vocal, guitar, percussive (also known as ‘Boom’) or both with a total of eight tracks that can run simultaneously. The pedal can also mute individual tracks as well as undo layers, which is track specific. The system in hosted in Ableton Live, which runs the plug-ins as well as patches some Choral and Delay plug-ins for certain songs. It’s completely digital, with all of the inputs from Ed’s guitars and vocals being wirelessly transmitted via a Sennheiser 9000 system.
“Matrixing and switching is controlled by the DiGiCo SD7, then fed into the Chewie II via AES. There is nothing in this system that stores sounds or loops. Once the Clear button has been hit, the machine is ready to record on a completely blank canvas."
-David White, Chewie Tech on the Divide World Tour