Listen for notes coming from the microphone and detect weather a certain note has been played. (perhaps display it on the screen) Please keep in mind that I am a beginner and I am new to processing and audio. Below is what I have so far. I am logging frequencies but I have no idea what the heck I am doing! Please help?

2. /* sketch to measure frequencies */
3. 
   
4. import ddf.minim.analysis.*;
5. import ddf.minim.*;
6. 
   
7. Minim minim;
8. AudioInput in;
9. PFont f;
10. FFT fft;
11. 
    
12. 
    
13. void setup()
14. {
15.   size(512, 200, P3D);
16.   minim = new Minim(this);
17.   
18.   in = minim.getLineIn(Minim.MONO, 2048);
19.   
20.   fft = new FFT(in.bufferSize(), 44100);
21.   
22.   f = createFont("Arial",16,true);
23.   textFont(f, 16);
24.   
25. }
26. 
    
27. void draw()
28. {
29.   background(0);
30.   stroke(255);
31. 
    
32.   fft.forward(in.mix);
33.   for(int i = 0; i < fft.specSize(); i++)
34.   {
35.     // draw the line for frequency band i, scaling it by 4 so we can see it a bit better
36.     line(i, height, i, height - fft.getBand(i)*2);
37.     
38.     String freq = str(fft.getFreq(i));
39.     println(freq);
40.   }
41.   fill(255);
42.  }
43. 
    
44. void stop()
45. {
46.   // always close Minim audio classes when you finish with them
47.   in.close();
48.   minim.stop();
49.   
50.   super.stop();
51. }