Hello,

            I am trying to make a virtual theremin with beads, to make it sound  like a  real deal  I applied tremolo effect like in code below, but if I try to change sound pitch quickly it begin generating an awful sound, you  clearly can hear that in example below, just try to move mouse cursor  fast as possible up an down. So my question is, what to do, to be able to change sound pitch quickly and smoothly and still get decent tremolo effect

                  thank in advance :)

 

2. // Frequency_Modulation_02.pde
3. 
   
4. import beads.*; //sound library 
5. AudioContext ac; // create our AudioContext
6. 
   
7. // declare our unit generators
8. WavePlayer modulator;
9. Glide modulatorFrequency;
10. WavePlayer carrier;
11. 
    
12. Gain g;
13. 
    
14. void setup()
15. {
16.   size(400, 300);
17. 
    
18.   // initialize our AudioContext
19.   ac = new AudioContext();
20.   
21.   // create the modulator, this WavePlayer will control the frequency of the carrier
22.   modulatorFrequency = new Glide(ac, 20, 30);
23.   modulator = new WavePlayer(ac, 1, Buffer.SINE);
24. 
    
25.   // this is a custom function
26.   // custom functions are a bit like custom Unit Generators (custom Beads)
27.   // but they only override the calculate function
28.   Function frequencyModulation = new Function(modulator)
29.   {
30.     public float calculate() {
31.       // return x[0], which is the original value of the modulator signal (a sine wave)
32.       // multiplied by 200.0 to make the sine vary between -200 and 200
33.       // the number 200 here is called the "Modulation Index"
34.       // the higher the Modulation Index, the louder the sidebands
35.       // then add mouseY, so that it varies from mouseY - 200 to mouseY + 200
36.       return (x[0] * 50.0) + mouseY;
37.     }
38.   };
39. 
    
40.   // create a second WavePlayer, control the frequency with the function created above
41.   carrier = new WavePlayer(ac, frequencyModulation, Buffer.SINE);
42. 
    
43.   g = new Gain(ac, 1, 0.5); // create a Gain object to make sure we don't peak
44. 
    
45.   g.addInput(carrier); // connect the carrier to the Gain input
46.   
47.   ac.out.addInput(g); // connect the Gain output to the AudioContext
48.   
49.   ac.start(); // start audio processing
50. }
51. 
    
52. void draw()
53. {
54.   modulatorFrequency.setValue(mouseX);
55. }