hello, i am trying to generate a simple scrolling white wave against a black background. the wave should respond to input sound from the microphone. i am actually hoping to generate the sound from an mp3 file later.
i can't seem to make it work. here is the code i have been using.
its a combination of the NoiseWave tutorial and the Example 20-5: Live Input with Sonia, both by by Daniel Shiffman.

i think iv'e just made a mess of it. there is something i don't understand.

any help greatly apprieciated.
dove


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;     // Using an array to store height values for the wave (not entirely necessary)

import pitaru.sonia_v2_9.*;
import processing.video.*;

void setup() {
 size(1024,768);
 Sonia.start(this); // Start Sonia engine.
 LiveInput.start(); // Start listening to the microphone
   frameRate(30);
 colorMode(RGB,255,255,255,100);
 smooth();
 w = width+16;
 yvalues = new float[w/xspacing];
 smooth();
 background(0);
}

void draw() {
 // Get the overall volume (between 0 and 1.0)
 float vol = LiveInput.getLevel();
  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*vol(xoff)-1)*amplitude;    
   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]);
}
// Close the sound engine
public void stop() {
 Sonia.stop();
 super.stop();
}
 }