// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 20-4: Manipulating sound (with Sonia)
  
  // Import the Sonia library
  import pitaru.sonia_v2_9.*;
  
  // A Sample object (for a sound)
  Sample tone;
  
  void setup() {
    size(200,200);
    // Start Sonia engine.
    Sonia.start(this); 
    
    // Create a new sample object.
    tone = new Sample( "tone.wav" );
    
    // Loop the sound forever
    // (well, at least until stop() is called)
    tone.repeat();
    smooth();
  }
  
  void draw() {
    if (tone.isPlaying()) {
      background(255);
    } else {
      background(100);
    }
    
    // Set the volume to a range between 0 and 1.0
    float ratio = (float) mouseX / width;
    tone.setVolume(ratio);
    
    // Set the rate to a range between 0 and 88,200
    // Changing the rate alters the pitch
    ratio = (float) mouseY / height;
    
     // The rate is set according to the mouseY position.
    tone.setRate(ratio*88200);
    
    // Draw some rectangles to show what is going on
    stroke(0);
    fill(175);
    rect(0,160,mouseX,20);
    stroke(0);
    fill(175);
    rect(160,0,20,mouseY);
  }
  
  // Pressing the mouse stops and starts the sound
  void mousePressed() {
    if (tone.isPlaying()) {
      tone.stop(); //   The sound can be stopped with the function stop().
    } else {
      tone.repeat();
    }
  }
  
  // Close the sound engine
  public void stop() {
    Sonia.stop();
    super.stop();
  }