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i checked on some of the staff tweets to see if they go into details but there aren't much. one notable thing i saw was one of the vj (Alpha-H3lixx) mentioned that it was their first time working at a virtual live house. makes me think that they probably made the video projection setup be interoperable with traditional video mixer board/software. make sense for their goal of lowering the cost of staffing for virtual live if they can hire any clubhouse dj/vj and lighting staff.
not sure if the performers had any input on any of these but i thought the vj and lighshow for lia's unreal was spot on. there are many other good ones like mair's survior too.