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Links to a more in depth way to do the musique concrete method and harsh noise wall (they don't use audacity, but it all can be done on audacity, just gives you an idea what I'm talking about)
visual of generating noise on audacity (for harsh noise, you want to have a larger amplitude or any thing that makes the noise louder)
https://youtu.be/CkZS1C7JUmM?si=qGe7g94lrBE-fAh6
Musique Concrete
https://youtu.be/hvI0URwiCJc?si=l_7N3DASLu4Cw7qQ
Harsh Noise Wall
https://youtu.be/_zwgleyfBgQ?si=IgtK3ydM0queuHBX