1. The sketch draws a three-dimensional cube in the center of the screen.
2. The cube rotates as the mouse is moved. It should rotate in the same direction as the mouse moves, left-right and up-down.
3. The cube becomes larger and changes color whenever the user presses a key on the keyboard. A sound effect of your choice (something like a stretching sound) should play whenever the cube gets larger.
4. The sketch should play some music in a continuous loop the whole time it's running.

Now, I have made a lot of progress on this assignment 

I have made a cube, it does rotate, it does change color with every key pressed, it does play a sound effect, and it does play music in a loop. 

The only problem is that I don't know how to assign a class variable to the size of the box, and I don't know how to make the box bigger with each key pressed. Could you guys help me out? 

Here's the code for reference purposes. Thanks again 

2. import ddf.minim.*;
3. import ddf.minim.signals.*;
4. import ddf.minim.analysis.*;
5. import ddf.minim.effects.*;
6. 
   
7. Minim loader;
8. AudioPlayer player;
9. 
   
10. //size of the box
11. float aa = 150;
12. 
    
13. 
    
14. void setup() {
15. size (600, 600, P3D);
16. 
    
17. //audio player
18. loader = new Minim(this);
19. player = loader.loadFile("cali.mp3");
20. player.loop();
21. 
    
22. }
23. 
    
24. 
    
25. void draw() {
26. 
    
27.  background(51);
28. 
    
29.  //rotating and placing the cube , map method
30.  translate(width/2, height/2);
31. 
    
32. //rotate about the x axis
33. float a = map(-1 * mouseY, 0, (width-1), 0, 2 * PI);
34. rotateX(a);
35. 
    
36.  //rotate about the y axis
37.  float b = map(-1 * mouseX, 0, (height-1), 0, 2 * PI);
38.  rotateY(b);
39. 
    
40.  //cube size and coloring
41.  box(aa);
42.  
43.  if (keyPressed == true){
44.   fill  (random (255), random (255), random (255));
45.    //plays the sound effect "bubble pop"
46.  player = loader.loadFile("bubblepop.mp3");
47.  player.play();
48.  box(aa + 34); 
49. }
50. 
    
51. 
    
52. 
    
53. }
54. 
    
55.  
56. 
    
57. //void mouseClicked() {
58. 
    
59.  //plays the sound effect "bubble pop"
60. // player = loader.loadFile("bubblepop.mp3");
61. // player.play();
62. 
    
63. //}