Simon the Magpie recently pointed one of his videos on the direction of Andrej Rublev, who has made the above video on a 'no input mixer'. It might sound implausible, but you can actually make noise using a mixer alone! By re routing signals, using sends, returns, EQs and more - even combining the multiple channels for some wild effects.
Artists like Toshimaru Nakamura have been using this technique for years. Here's a great article with him: https://daily.bandcamp.com/lists/toshimaru-nakamura-discography-list
Here's a link to Simons video:
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