Image Change with Microphone in Image Processing

Processing Libraries
1

Hello,
I want to change the image already in the code below with another one I have depend on microphone. How can I do this?

/**
 * Extrusion. 
 * 
 * Converts a flat image into spatial data points and rotates the points
 * around the center.
 */

import processing.sound.*;

AudioIn input;
Amplitude analyzer;
PImage a;
boolean onetime = true;
int[][] aPixels;
int[][] values;
float angle;

void setup() {
  size(2000, 2000, P3D);
  surface.setLocation(100, 100);
  input = new AudioIn(this, 0);

  input.start();
  analyzer = new Amplitude(this);
  analyzer.input(input);

  aPixels = new int[width][height];
  values = new int[width][height];
  noFill();

  // Load the image into a new array
  // Extract the values and store in an array
  a = loadImage("black2-01.jpg");
  a.loadPixels();
  for (int i = 0; i < a.height; i++) {
    for (int j = 0; j < a.width; j++) {
      aPixels[j][i] = a.pixels[i*a.width + j];
      values[j][i] = int(blue(aPixels[j][i]));
    }
  }
}

void draw() {
  background(0);
  translate(width/2, height/2, -height/2);
  scale(2.0);
  
  // Update and constrain the angle
  angle += 0.005;
  rotateY(angle);  
  
  // Display the image mass
  for (int i = 0; i < a.height; i += 4) {
    for (int j = 0; j < a.width; j += 4) {
      stroke(values[j][i], 255);
      line(j-a.width/2, i-a.height/2, -values[j][i], j-a.width/2, i-a.height/2, -values[j][i]-10);
    }
  }
}