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He isn't playable in the SAGE Demo, at least not without modding.

There's another public demo with the Noise though, it's called Noise's Hardoween.

However, if you want to play with the updated version of Noise, you will have to pay at least 5 dollars to Pizza Tower Guy's patreon.

If you're referring to super taunt, then all you need to do is taunt while you have a combo of 3 or higher.