as a beginner its not always easy to see the obvious solution! i'm not a programmer so this is a process of discovery for me.

here's an example of a waveform i would like to generate. this one is triggered by perlin noise, which i would like to replace by an mp3 file. i have included the minim code dis-activated.
i think the key to my woe's here is the 'noise' variable under renderWave. i can't seem to find an appropriate replacement. i have tried 'get' but it doesn't work.

any help would be greatly appreciated.
d

//import ddf.minim.*;

int xspacing = 16;   // How far apart should each horizontal location be spaced
int w;    // Width of entire wave

float yoff = 0.0f;   // 2nd dimension of perlin noise
float[] yvalues;

//Minim minim;
//AudioPlayer son;

void setup() {
 size(1024,768);

 // minim = new Minim(this);
//   son = minim.loadFile("son.mp3", 512);
 //son.play();

 frameRate(30);
 colorMode(RGB,255,255,255,100);
 smooth();
 w = width+16;
 yvalues = new float[w/xspacing];
 }

void draw() {
 background(0);
 calcWave();
 renderWave();
}

void calcWave() {
 float dx = 0.06f;
 float dy = 0.02f; //speed of scroll
 float amplitude = 100.0f;

 // Increment y ('time')
 yoff += dy;

 float xoff = yoff;

 for (int i = 0; i < yvalues.length; i++) {
   yvalues[i] = (2* noise (xoff)-1)*amplitude;    // here i think i need to replace noise for get or toArray but i can't figure out how to make it work!!!
   xoff+=dx;
 }
}

void renderWave() {

for (int x = 0; x < yvalues.length-1; x++) {
 stroke(255);
 strokeWeight(3);

  line(x*xspacing,width/2+yvalues[x],(x-1)*xspacing,width/2+yvalues[x+1]);
}
}

void stop()
{
 son.close();
 input.close();
 minim.stop();
}

not really.
i want to create a scrolling wave... i will look more closely at the code involved in what you have sent me to see if there are any clues within, but essentially i want a scrolling wave like the perlin noise tutorial by shiffman, however i want to trigger the wave from an mp3 file.

thanks for the suggestion.

d