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let mic;
let particles = [];
function setup() {
createCanvas(600, 600);
rectMode(CENTER);
mic = new p5.AudioIn();
mic.start();
}
function draw() {
let volume = mic.getLevel(1);
let d = volume * 400;
push();
translate(width/2,height/2);
rotate(frameCount / 20.0);
ellipse(d,d,d, d);
pop();
}