Am trying to control the gain from the slider rather than mouse position. Have had a go at this, but am at dead end- any help please?

Josh

2. // Hello_Glide_01.pde
3. 
   
4. // import the beads library (you must have installed it properly. as of this writing, it is not included with Processing)
5. import beads.*;
6. import controlP5.*;
7. import processing.opengl.*;
8. 
   
9. ControlP5 cp5;
10. 
    
11. 
    
12. // create our AudioContext, which will oversee audio input/output
13. AudioContext ac;
14. 
    
15. // declare our unit generators (Beads) since we will need to access them throughout the program
16. WavePlayer wp;
17. Gain g;
18. Glide gainGlide;
19. 
    
20. void setup()
21. {
22.   size(400, 300);
23. 
    
24.   // initialize our AudioContext
25.   ac = new AudioContext();
26.   
27.   // create a WavePlayer
28.   wp = new WavePlayer(ac, 440, Buffer.SINE);
29.   
30.   // create the Glide object
31.   // Glide objects move smoothly from one value to another
32.   // 0.0 is the initial value contained by the Glide
33.   // it will take 50ms for it to transition to a new value
34.   gainGlide = new Glide(ac, 0.0, 50);
35.   
36.   // create a Gain object
37.   // this time, we will attach the gain amount to the glide object created above
38.   g = new Gain(ac, 1, gainGlide);
39. 
    
40.   // connect the WavePlayer output to the Gain input
41.   g.addInput(wp);
42.   
43.   // connect the Gain output to the AudioContext
44.   ac.out.addInput(g);
45.   
46.   // start audio processing
47.   ac.start();
48.   
49.   cp5 = new ControlP5(this); 
50.   ControlWindow cw = cp5.addControlWindow("controlP5window", 208, 396, 800, 250, 30);
51.   Slider s = cp5.addSlider("gain",0,200,128,20,100,10,100);
52.     s.setWindow(cw);
53.   
54.   background(0); // set the background to black
55.   text("Move the mouse to control the sine gain.", 100, 100); // tell the user what to do!
56. }
57. 
    
58. void draw()
59. {
60.   // in the draw routine, we will update our gain
61.   // since this routine is called repeatedly, this will continuously change the volume of the sine wave
62.   // based on the position of the mouse cursor within the Processing window
63.   gainGlide.setValue(mouseX / (float)width);
64.     //gainGlide.setValue(Slider s);
65. 
    
66. }