Java SE (Java Platform, Standard Edition)

Hi, I'm trying to make a remote audio control and I need a way to set current volume by code.

After looking at java sound APIs I came up with this:

line = mixer.getLine(lineInfo);
boolean opened = line.isOpen() || line instanceof Clip;
if(!opened){
	System.out.println("Line is not open, trying to open it...");
	line.open();
	opened = true;
}
if(line.isControlSupported(FloatControl.Type.VOLUME)){
		FloatControl volumeCtrl = (FloatControl)line.getControl(FloatControl.Type.VOLUME);
               System.out.println("Current volume is: "+volumeCtrl.getValue());
}

I tried this code with every mixer I have (althought I think it's the "SPEAKER" one...) but I always get 1.0 as current volume, no matter what.
So, I'm getting something wrong..can you help me?:(