Im pretty much  newb at this and have very little idea what im doing. I want the code to detect sounds and trigger a background change/another .wav file . I'm using getLineIn to detect the sounds but I cant figure out how to get that info to trigger the background/sound change.
My current code:

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


 AudioSnippet s1;
 AudioSnippet s2;
 AudioSnippet s3;
 AudioSnippet s4;
 AudioSnippet s5;

 int bask;
float sum;
float averageAudioInput;
float scaledAudioInput;

 void setup(){
  size(600,600,P2D);
  background(0);
 
  minim = new Minim(this);
  s1 = minim.loadSnippet("andsword.wav");
    s2 = minim.loadSnippet("Boom.wav");
      s3 = minim.loadSnippet("Horn.wav");
        s4 = minim.loadSnippet("twang.wav");
          s5 = minim.loadSnippet("windandstring.wav");
    

  minim = new Minim(this);
  minim.debugOn();
 
  // get a line in from Minim, default bit depth is 16
  in = minim.getLineIn(Minim.STEREO, 512);

 }

void draw()
{
  background(0);
  stroke(255);
 
  // draw the waveforms
  for(int i = 0; i < in.bufferSize() - 1; i++)
  {
    line(i, 50 + in.left.get(i)*150, i+1, 50 + in.left.get(i+1)*150);
    line(i, 150 + in.right.get(i)*150, i+1, 150 + in.right.get(i+1)*150);
   }
 }

 void function(){
   for (int i = 0; i < 1; i++){
   float r = (1000*in.right.get(i));
   float l = (1000*in.left.get(i+1));
   float number = ((r*l)/2);
   //println(number);
   if ( number > 100) {
     s1.rewind();
     s1.play();
   }
 //if(1 > 150)
 //{
 //s1.rewind();
 //s1.play();
 //background(255);
  }
   }


 void stop(){
  // always close Minim audio classes when you are done with them
  in.close();
  minim.stop();
 
  super.stop();
}

there are two options in void function() that i was fiddling with but i couldn't get either to work... Any idea what should work, or what im doing wrong?