Jimmy,
From what I can tell, he used the same rhythm track ( with bass and drum solos) and sent them to about 25 other guitar players to do their thing over it... Mike Stern, Scott Henderson, Oz Noy, Brent Mason, Dean Brown are notable. It ended up being 27 tracks...or 27 interpretations of 1 track, which is an interesting listen.
Getting to hear your bass solo 27 times made my work day a whole lot better too!
All the best,
Ed V