I am trying to make a doorbell in processing that plays a note at the click of the mouse. The doorbell is supposed to jiggle while the note is playing, but Im having difficulty with a few minor problems that I cant seem to figure out. If anyone could please help me out in telling me what it is I did wrong with my code, it would be greatly appreciated. Thank you!!!!

Code:

import ddf.minim.*;

// A doorbell object (that will trigger the sound)
Doorbell doorbell;
Minim minim;

void setup() {
  size(200,200) ;
 
  // start up minim
  Minim = new Minim(this) ;
 
  // Create a new doorbell
  doorbell = new Doorbell(150, 100, 32, "note.wav") ;
 

   
    // Show the doorbell
    doorbell.display(mouseX,mouseY) ;
    doorbell.jiggle() ;
  }
 
  void mousePressed() {
    // If the user clicks on the doorbell, play the sound!
    if (doorbell.contains(mouseX,mouseY)) {
      doorbell.ring();
    }
  }
 
  // Close the sound files
  public void stop() {
  doorbell.close() ;
  super.stop() ;
  }
 
  class Doorbell {
    // Location and size
    float x;
    float y;
    float r;
   
    // An audio snippet object
    AudioSnippet note;
   
    // Create the doorbell
    Doorbell (float x_, float y_, float r_, String filename) {
      x = x_;
      y = y_;
      r = r_;
     
      // load note.wav into a new Audiosnippet
      note = Minim.loadSnippet(filename) ;
    }
   
    // If the "doorbell" is ringing, the shape jiggles
    void jiggle() {
      if (note.isPlaying()) {
        x += random(-1,1) ;
        y += random(-1,1) ;
        r = constrain(r + random(-2,2) , 10, 100);
      }
    }
   
    // The doorbell rings!
    void ring() {
      if (!note.isPlaying()) {
        note.rewind();
        note.play();
      }
    }
   
     void draw() {
    background(100,100,126) ;
   
    // Is a point inside the doorbell (used for mouse rollover, etc.)
    boolean contains(float mx, my) {
      if (dist (mx,my,x,y) < r) {
        return true;
      } else {
        return false;
      }
    }
   
    // Show the doorbell (hardcoded colors, could be improved)
    void display(float mx, float my) {
      if (contains (mx,my)) {
        fill ( 126,114,100);
      } else {
        fill(119, 152, 202);
      }
      stroke(202,175,142);
      ellipse(x,y,r,r);
    }
   
    void close() {
      note.close();
    }
  }