Analyzing sound problem in effect 03 (minim)

Processing Libraries
1 
float t; // currentTime
int t1 = 2000;  //2000ms  = after 2s
int t2 = 6000;  //6000ms = after 6s
int t3 = 10000; //10000ms = after 10s
int t4 = 15000; //1500ms = after 15s
int finish = 20000;  //2000ms = 20s

Amplitude amp;
float a; // amplitude value = a
float x; // x-pos of the shape
float c; //rotation of the shape

float n4;
float n6;
float n5 = 0.01;

int n;
Square[] rect;
float x2 = 0;

//MUSIC  
import ddf.minim.*;
import ddf.minim.signals.*;
Minim minim;
AudioPlayer mySound;
// for fixing delay problem
Boolean isStart=false;
float delay;

void setup() {
  fullScreen();
  noCursor();
  smooth();
  background (0);
  frameRate(50);
 
  
  minim = new Minim(this);
  mySound = minim.loadFile("hill.mp3");    
  mySound.play();
  
  n = 10; // number of rect
  rect = new Square[n]; //storing rect in array
  for (int i=0; i<n; i++) {
    rect[i] = new Square(i); //number of rect
  }
}
void draw() {
  background(0);

  // for fixing delay problem
  if (!isStart) {
    mySound.play();
    delay=millis();
    isStart=true;
  }  

  t = (millis()-delay)%finish;
  //a = amp.analyze();

  //Event/Effect 1 : 0s - 2s
  if (t < t1) {
    effect01();
  }
  //Event/Effect 2 : 2s ~ 6s
  if (t > t1 && t <t2) {
    effect02();
  }
  //Event/Effect 3 :  6s~10s
  if (t >t2 && t <t3) {
    effect03();
  }
  //Event/Effect 4 :  10s~15s
  if  (t >t3 && t <t4) {
    effect04();
  }
  //Event/Effect 5 :  15s~20s
  if  (t >t4 && t <finish) {
    effect05();
  }

  displayTime();
}
2 
void effect02() {
  background(0);

  for (int i=0; i<n; i++) {
    rect[i].display(); // display rect
  }
}
class Square {
  Square(int index) {
  }
  void display() {
    float x1 = 0; // mapping for noise
    fill(random(255), random(255), random(255)); // fill of rect
    for (int i = 0; i < width; i++) { 
      rect(i*90, noise(x1, x2)*1000, 30, 30); // position and size of rect 
      x1 -= map(mouseX, 0, width, 0.0001, 1 ); //mapping the x1 for noise
      frameRate(10);
    }
    for (int j = 0; j < width; j++) {
      x2 -= map(j, 0, width, 0.00001, 1); // mapping x2 for noise
    }
  }
}

how can I make it react to music

3 
void effect03() {
  //println(amp.analyze());
  fill(amp.analyze() + 1000,10);
  rect(0,0,width,height);
  
  float d = amp.analyze()*1000;
  float c = amp.analyze()*500;
  fill(c, random(c), 200);
  
  ellipse(width/2, height/2, d,d);
  
  float s = map(mouseX, 0, width, 0, 1.0);
  //song.amp(s);
}

this one I’m facing issues. It’s all one code