WEB Technique Tunings David uses a number of different tunings. With all these variations use a capo to play in different keys. It's neither major nor minor. Listen to Ry Cooder.
C tunings are also very useful.
Looping David uses two digital looping devices on stage. The Lexicon JamMan allows up to thirty seconds of recording time and seemingly endless layering with very little degradation in terms of audio quality. The Boomerang Phrase Sampler will record up to four minutes which can then be played back at will. The sound quality isn't quite as good as the Lexicon, but it is much easier to use and the extended recording time allows for it to be used much more musically. Both devices are controlled by foot switches.