I would like to do a real time sound synthesis, and audio will be play through another player such as quicktime/windows media player, using Minim library, to real time extract the volume and FFT value from the speaker.

From the documentation, I found that 'getlineout' should be quite useful in doing so, however the example that I play isn't work, the wave and the sound play is not according to the audio from speaker. Is it my PC settings problem or I should use another function call?

thanks

/////////////////////////example code from processing////////
import ddf.minim.*;
import ddf.minim.signals.*;

Minim minim;
AudioOutput out;
SineWave sine;

void setup()
{
 size(512, 200, P2D);
 
 minim = new Minim(this);
 
 // get a line out from Minim, default sample rate is 44100, default bit depth is 16
// out = minim.getLineOut(Minim.STEREO, 2048);
 out = minim.getLineOut();
 
 
 // create a sine wave Oscillator, set to 440 Hz, at 0.5 amplitude, sample rate 44100 to match the line out
 sine = new SineWave(440, 0.5, out.sampleRate());
 // add the oscillator to the line out
 out.addSignal(sine);
}

void draw()
{
 background(0);
 stroke(255);
 // draw the waveforms
 for(int i = 0; i < out.bufferSize() - 1; i++)
 {
   line(i, 50 + out.left.get(i)*50, i+1, 50 + out.left.get(i+1)*50);
   line(i, 150 + out.right.get(i)*50, i+1, 150 + out.right.get(i+1)*50);
 }
}

AudioOutput is for generating your own sound. If you want to monitor the output from another application, like quicktime, you will need to use an AudioInput and also set the record source to "stereo mix" as eppur explains. Keep in mind this input will also catch any sound you generate yourself, which might be what you want.