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How can i use sound to fade an image

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Hi there, 

I am trying to make sound fade an image using an input and getting it to activate the opacity levels.
I have a very limited knowledge of processing and am stuck as to where to go next! This is how far I have got:

import ddf.minim.*;
Minim minim;
AudioInput in;

float t = 0;

PImage myImage;
void setup(){
  size(875,575);
  myImage = loadImage("g058.jpg");
  
   smooth();
  
  minim = new Minim(this);
  
  minim = new Minim(this);
  minim.debugOn();
  
  in = minim.getLineIn(Minim.STEREO,40000);

}
void draw(){
  background(255);
  translate(437,287);
  tint(t); 
  image( myImage, -myImage.width/2.0, -myImage.height/2.0 );

t = (t+in.left.get(0)*40000);
 
}

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