Hi everyone.

 

I just started with processing and im stuck now.

 

I want to play two frequencies at the same time. Right now i can only play one frequency at a time.

i need to make a new function that takes the frequency when to keys are pressed at the same time and then dived them by two. Thats is the new freqency that should be played.

 

i hope you guys can help me or point me at the right direction.

Here is my code

    import ddf.minim.*;  //sound library
    import ddf.minim.signals.* ;
    import ddf.minim.effects.* ;
    
    Minim minim;
    AudioOutput au_out ;
    SquareWave sqw ;
    LowPassSP lpass ;
   
   
    Boolean[] firstkey, secondkey;
    float[] notes = {
      0, 261.63, 293.67, 329.63, 349.23, 391.99, 440, 493.88, 523.25
    };
    color w = #FFFFFF;
    color b = #000000;
    color[] buttonsColor = {
      w, w, w, w, w, w, w, w
    };
    
    void setup() {
    
      size(800, 600);
    
      minim = new Minim(this) ;
      au_out = minim.getLineOut() ; //channel
      sqw = new SquareWave(440, 1, 44100); // frequentie wave
      lpass = new LowPassSP(200, 44100); // filter
      au_out.addSignal(sqw);
      au_out.addEffect(lpass);
      sqw.setFreq(notes[0]) ;
      frameRate(60);
    }
    
    
    
    void draw ()
    {
     
     
      textSize(14);
      text("Use the following keys to play the piano.'A', 'S', 'D', 'F', 'H', 'J', 'K', 'L', ", 10, 400); 
    
      fill(buttonsColor[0]);
      rect(50, 50, 70, 300);
      fill(buttonsColor[1]);
      rect(120, 50, 70, 300);
      fill(buttonsColor[2]);
      rect(190, 50, 70, 300);
      fill(buttonsColor[3]);
      rect(260, 50, 70, 300);
      fill(buttonsColor[4]);
      rect(330, 50, 70, 300);
      fill(buttonsColor[5]);
      rect(400, 50, 70, 300);
      fill(buttonsColor[6]);
      rect(470, 50, 70, 300);
      fill(buttonsColor[7]);
      rect(540, 50, 70, 300);
      fill(b);
      rect(85, 50, 40, 225);
      rect(170, 50, 40, 225);
      rect(295, 50, 40, 225);
      rect(380, 50, 40, 225);
      rect(380, 50, 40, 225);
      rect(450, 50, 40, 225);
    }
    
    
    void keyPressed() {
      if (key == 'a') {
        sqw.setFreq(notes[1]) ;
        buttonsColor[0] = b;
      }
       if (key == 's') {
        sqw.setFreq(notes[2]);
        buttonsColor[1] = b;
      }   
       if(key == 'd') {
        sqw.setFreq(notes[3]) ;
        buttonsColor[2] = b;
      }
       if(key == 'f') {
        sqw.setFreq(notes[4]) ;
        buttonsColor[3] = b;
      }
       if(key == 'h') {
        sqw.setFreq(notes[5]) ;
        buttonsColor[4] = b;
      }
       if(key == 'j') {
        sqw.setFreq(notes[6]) ;
        buttonsColor[5] = b;
      }
       if(key == 'k') {
        sqw.setFreq(notes[7]) ;
        buttonsColor[6] = b;
      }
       if(key == 'l') {
        sqw.setFreq(notes[8]) ;
        buttonsColor[7] = b;
      }
    }
    
    void  keyReleased()
    {
      if(key == 'a'){
        sqw.setFreq(notes[0]);
        buttonsColor[0] = w;
      }
       if(key == 's'){
        sqw.setFreq(notes[0]) ;
        buttonsColor[1] = w;
      }   
       if(key == 'd'){
        sqw.setFreq(notes[0]) ;
        buttonsColor[2] = w;
      }
       if(key == 'f'){
        sqw.setFreq(notes[0]) ;
        buttonsColor[3] = w;
      }
       if(key == 'h'){
        sqw.setFreq(notes[0]) ;
        buttonsColor[4] = w;
      }
       if(key == 'j'){
        sqw.setFreq(notes[0]) ;
        buttonsColor[5] = w;
      }
       if(key == 'k'){
        sqw.setFreq(notes[0]) ;
        buttonsColor[6] = w;
      }
       if(key == 'l') {
        sqw.setFreq(notes[0]) ;
        buttonsColor[7] = w;
      }
    }