some of the other answers might get you something close (just be sure to crank the fuzz with some kind of tube preamp, and probably even a line booster - this is very high gain), but it sounds to me like that octave-y sound is actually an electronic relic of his guitar synthesizer tracking in and that the actual answer is something along the lines of digital distortion on a violin or cello patch, rather than anything created with guitar pedals you can get in a store. it's also probably manual whammy technique getting that envelope wah, rather than anything digital.