Sound Mixer in Windows 7 not available?

Info inf[]=AudioSystem.getMixerInfo();
Mixer myOutputMixer=null;
// find sound device with fancy name
for(int i=0;i<inf.length;i++){>
    String a=inf[i].getDescription();
    String name=inf[i].getName();
    if(name.startsWith("USB HAMA (USB Sound Device)     ")){
        myOutputMixer=AudioSystem.getMixer(inf[i]);
    }
}

// play sound
File soundFile = new File("Sounds/chord.wav");
AudioInputStream sound = AudioSystem.getAudioInputStream(soundFile);

try {
    Clip sline = (Clip)myOutputMixer.getLine(
        new DataLine.Info(Clip.class,sound.getFormat())
    );
    sline.open(sound);
    sline.start();
} catch (LineUnavailableException ex) {  }