Displaying text within each circle is not all that difficult.
Where you draw the circles, you call after that

textAlign(CENTER); //Draw Text from the center
textSize(16); //Set text size to 16, you might want to change this
fill(255); //Set text color to white
text("Your Text Here", X, Y);

(And you don't have to set the text settings every time)

Obviously with X and Y being each circle location.

As for rendering them in 3D, you can use sphere() along with translate() and I believe that text() should still work in 3D.
Good Luck.

Making it 3D is a lot more complicated than that. Check out the size() Reference and the ellipse Reference (look at my previous response) for some help there and probably other places, but for now, we should focus on the other problem:

You call text("sound",X,Y); but X and Y are the location which clearly does not exist. I have no clue why the compiler didn't point out the X and Y don't exist, but if you change them to pos1X and pos1Y (The location of your circle) it will display properly. Sorry if I wasn't very clear about that.

cool, calsign, this now works!

That sounds suspicious....

Not that I know of, you already have smoothing enabled.

Hi Calsign,

Can't fully answer right now, but start off by adding the third parameter to size() as P3D (make the sketch 3D)
then use camera() to set up the view of your sketch
use translate() to position your sphere
and finally, sphere() to draw your sphere

Look at the links as they show you how to set up the function, I'll get back with more detail later.

I implemented the 3D part like so:

1. boolean over1 = false;
2. boolean selected1 = false;
3. int pos1X, pos1Y, pos1Z ; // HERE: add a pos1Z variable, even though it will not be changed
4. int offset1X, offset1Y ;
5. float radius = 25.0f;
6. void setup()
7. {
8.   size(512, 512, P3D); //HERE: Set the renderer to P3D
9.  
10.   textFont(createFont("SanSerif", 12));
11.  
12.   pos1X = 0;
13.   pos1Y = 0;  
14.   pos1Z = 0;
15.   //HERE: set default position to (0, 0, 0)
16.  
17.   smooth();
18.  
19.   noStroke(); //noStroke makes the sphere look good
20.  
21.   camera(0, -200, -400, 0, 0, 0, 0, 1, 0);
22. }
23. void draw()
24. {
25.   background(0);  
26.   strokeWeight (1.0f);
27.   fill(255,155,40);
28.   {
29.     float valSideways = map(pos1X, 0, width, -1, 1);
30.     
31.     float valUpdown = map(pos1Y, 0, height, 6, -48);
32.     
33.     //HERE: translate() to set the location
34.     translate(pos1X, pos1Y, pos1Z);
35.     
36.     sphere (radius*2.0f); //HERE: sphere() takes one parameter, the radius
37.     
38.     fill (255,0,0);    
39.     
40.   }
41.  
42.   }
43. void stop()
44. {
45.  
46. }
47. void mouseMoved() {
48.   over1 = false;
49. //  if (sqrt(sq(mouseX-screenX(pos1X, pos1Y))+sq(mouseY-screenY(pos1X, pos1Y)))<=radius) { //HERE: You know what? jst try using this collision detection...
50. //    over1 = true;
51. //  }
52.   if(dist(screenX(pos1X, pos1Y), screenY(pos1X, pos1Y), mouseX, mouseY) <= radius) { //HERE: Just use this... its easier
53.     over1 = true;
54.   }
55. }
56.  
57. void mousePressed() {
58.   if (over1) {
59.     selected1 = true;
60.     offset1X = (int) screenX(pos1X, pos1Y)-mouseX; //HERE: Make that screenX and screenY so that it detects it properly
61.     offset1Y = (int) screenY(pos1X, pos1Y)-mouseY;
62.   }
63.  
64.   }
65.  
66. void mouseReleased() {
67.   selected1 = false;
68. }
69. void mouseDragged()
70. {
71.   if (selected1) {
72.     pos1X = max(0,min(mouseX+offset1X,width));
73.     pos1Y = max(0,min(mouseY+offset1Y,height));
74.     println(offset1X + ", " + offset1Y);
75.   }
76.  
77.   }
78.  
    

and started working on mouse moving, but found your methods far too confusing for me to convert. See if you can finish what I have already. For reference, look at screenX() and screenY() - I use them quite a bit.