I'm in emergency, please help me with this.

I'm using just following sample code:

import ddf.minim.*;
import ddf.minim.signals.*;

Minim minim;
AudioOutput out;
//WaveformRenderer waveform;
SawWave saw;

void setup()
{
 size(512, 200);
 minim = new Minim(this);
 out = minim.getLineOut();

 //waveform = new WaveformRenderer();
 // see the example Recordable >> addListener for more about this
 //out.addListener(waveform);

 // see the example AudioOutput >> SawWaveSignal for more about this
 saw = new SawWave(100, 0.2, out.sampleRate());
 // see the example Polyphonic >> addSignal for more about this
 out.addSignal(saw);

 textFont(createFont("Arial", 12));
}

void draw()
{
 background(0);
 // see waveform.pde for more about this
 //waveform.draw();

 if ( out.hasControl(Controller.PAN) )
 {
   text("The current pan value is " + out.getPan() + ".", 5, 15);
 }
 else
 {
   text("The output doesn't have a pan control.", 5, 15);
 }

 if ( out.hasControl(Controller.VOLUME) )
 {
   text("The current volume value is " + out.getVolume() + ".", 5, 30);
 }
 else
 {
   text("The output doesn't have a volume control.", 5, 30);
 }

 if ( out.hasControl(Controller.BALANCE) )
 {
   text("The current balance value is " + out.getBalance() + ".", 5, 45);
 }
 else
 {
   text("The output doesn't have a balance control.", 5, 45);
 }

 if ( out.hasControl(Controller.GAIN) )
 {
   text("The current gain value is " + out.getGain() + ".", 5, 60);
 }
 else
 {
   text("The output doesn't have a gain control.", 5, 60);
 }
}

void keyReleased()
{
 if ( key == 'v' ) out.shiftVolume(0, 1, 2000);
 if ( key == 'g' ) out.shiftGain(-40, 0, 2000);
 if ( key == 'b' ) out.shiftBalance(-1, 1, 2000);
 if ( key == 'p' ) out.shiftPan(1, -1, 2000);
}

void stop()
{
 // always close Minim audio classes when you are finished with them
 out.close();
 minim.stop();

 super.stop();
}





and the result on the screen is:

The current pan value is 0.0.
The output doesn't have a volume control.
The current balance value is 0.0.
The current gain value is 0.0.


It says this program doesn't have a volume control.
and I have the same problems on other computers.

I just need to get a volume control, but I just cannot find the way to do it.

How can I get a volume control?!!!!!!!

PLEASE HELP ME!!!!!PLEASE!!!!!!!! Im about to cry