#2
i cant watch the vid, school blockings ftl... but im guessing its done with a talk box
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#3
its not processed exactly, its just a recording of him singing an octave higher playing at the same time to give that effect
#4
yeah its all done in production. hard to tell exactly whether its an octave up like you said, he might have just 'copied and pasted' the vocals and then off-set them a little bit to make it sound like 2 people. you could always just get your buddy to talk with you, and it would probably sound similar.