i have tried to modify the band pass filter example to include more bands (i'm trying to make a simple graphic e.q.). Problem is that i want to only turn down the selected band  (moving mouseY over the coloured rectangles)  leaving the other frequencies playing. How can i turn down just the one band?  Any help, modifications to attached code, etc would be really appreciated.

2. /**
3.  * Band Pass Filter
4.  * by Damien Di Fede.
5.  *   
6.  * This sketch demonstrates how to use the BandPass effect.
7.  * Move the mouse left and right to change the frequency of the pass band.
8.  * Move the mouse up and down to change the band width of the pass band.
9.  */
10. 
    
11. 
    
12. import ddf.minim.*;
13. import ddf.minim.effects.*;
14. 
    
15. Minim minim;
16. AudioPlayer groove;
17. BandPass bpf;
18. BandPass bpf1;
19. 
    
20. 
    
21. 
    
22. void setup()
23. {
24.   size(512, 200, P2D);
25.   
26.   minim = new Minim(this);
27.   
28.   groove = minim.loadFile("groove.mp3");
29.   groove.loop();
30.   // make a band pass filter with a center frequency of 440 Hz and a bandwidth of 20 Hz
31.   // the third argument is the sample rate of the audio that will be filtered
32.   // it is required to correctly compute values used by the filter
33.   bpf = new BandPass(1000, 300, groove.sampleRate());
34.   //bpf1 = new BandPass(880, 20, groove.sampleRate());
35. 
    
36.   groove.addEffect(bpf);
37.   
38. 
    
39.   
40. }
41. 
    
42. void draw()
43. {
44.  
45.   background(0);
46.   stroke(255);
47.   noStroke();
48.   fill(255, 0, 0);
49.   //First rect area starting at coordinates (20,0),width = bpf.getBandWidth()/10, height = height
50.   rect(20,0, bpf.getBandWidth()/10, height);
51.   
52.   //Second rect area starting at coordinates (100,0),width = bpf.getBandWidth()/10, height = height
53.   fill(0, 255, 0);
54.   rect(100,0, bpf.getBandWidth()/10, height);
55.   
56.   //Third rect area starting at coordinates (200,0),width = bpf.getBandWidth()/10, height = height
57.   fill(0, 0, 255);
58.   rect(200,0, bpf.getBandWidth()/10, height);
59.   
60.   
61. }
62. 
    
63. void mouseMoved()
64. {
65.    //initialise local variables
66.    float passBand = 0;
67.    float valGain = 0;
68.    
69.    //settings related to first rect
70.    if(mouseX<20+bpf.getBandWidth()/10 && mouseX>20)
71.    {
72.       passBand = map(mouseX, 0, width, 100, 5000);
73.       valGain = map(mouseY, 0, height, 16,-48);
74.    } 
75.   
76.    //settings related to second rect
77.    if(mouseX<100+bpf.getBandWidth()/10 && mouseX>100)
78.    {
79.       passBand = map(mouseX, 0, width, 100, 5000);
80.       valGain = map(mouseY, 0, height, 16,-48);
81.    } 
82.   
83.    //settings related to third rect
84.    if(mouseX<200+bpf.getBandWidth()/10 && mouseX>200)
85.    {
86.       passBand = map(mouseX, 0, width, 100, 5000);
87.       valGain = map(mouseY, 0, height, 16,-48);
88.    } 
89. 
    
90.   bpf.setFreq(passBand);
91.   groove.setGain(valGain); 
92.   // prints the new values of the coefficients in the console
93.   //bpf.printCoeff();
94. }
95. 
    
96. void stop()
97. {
98.   // always close Minim audio classes when you finish with them
99.   groove.close();
100.   // always stop Minim before exiting
101.   minim.stop();
102.   
103.   super.stop();
104. }