The cube is just for show. When stripped down to musical equipment, it's basically what he's using in this video, just with updated equipment and a bigger mixer.
That is essentially all he is doing. And he will admit that himself. The knobs will control various effects (reverb or echoes for example) or filters (removing treble or bass etc) - at around 2:50 he is adding a delay (echo) to the vocal. He can add effects do individual parts of the tracks (take the lows out of the drums for example) but the structure of the songs is pre set. Anyone could do it. But he's still great live, as its about the atmosphere and his "show" (lights, video etc).
This is in fact Joel, it's deadmau5 lit, this guy has a tattoo some scissors on his left arm, I made some research and I found pictures that show the same tattoo on Joel's arm in 2018, I checked his tattoos in 2009 and he had non on his right arm, just a pair of scissors on the left. To clear things up even more he said that back then he was broke and that's why the musical video from "Ghosts 'N' Stuff" was so cheaply made, so it's probable that he went to a mall to get paid. So yes, this is in fact deadmau5 in a mall playing music.
This is another video that proves my theory, look at Joel's left hand, he has the same scissors as in this one and he is without the mask plus he is playing in a mall and its 2010. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-PVZnBngZADM.html
Where is the rest of this video? Does this line-up have a name? I watched the hard intro version on his channel however there is no more of the playlist? Can this be purchased?
I tried doing this once. I showed up at the mall with all my gear, and Thomas Bangalter helmet from Daft punk. They thought I was a robotic terrorist, and kicked me out.
Im pretty sure he adds loops and just right now mixed moar ghosts and stuff w/ ghosts n stuff. You cant just press play on both songs and pray that it will sound good. deadmau5 even mentioned in an inverview that he CAN dj