public class PlaylistSpectrumPanel
      extends JPanel implements Toogleable
{
  private static Logger log = Logger.getLogger(PlaylistSpectrumPanel.class);

  /**
   * The Spectrum Panel
   */
  private final SpectrumPanel spectrumPanel;
  /**
   * The Playlist Panel
   */
  private final Playlist playlistPanel;

  private boolean isSpectrumShown = true;

  private ServerPanel serverPanel = new ServerPanel(new ServerTable());

  private JComponent lastFileView = null;

  private final AWTCanvasTest awtCanvas;

  public PlaylistSpectrumPanel(AWTCanvasTest awtCanvas, SpectrumPanel spectrumPanel, Playlist playlistPanel)
  {
      super();
      this.spectrumPanel = spectrumPanel;
      this.playlistPanel = playlistPanel;
      this.awtCanvas = awtCanvas;
      setLayout(new BorderLayout());
      add(awtCanvas, BorderLayout.CENTER);
      lastFileView = playlistPanel;

      System.out.println("awtCanvas.getPreferredSize():" + awtCanvas.getPreferredSize());

  }

  public void toogle()
  {
      toogleSpectrum();
  }

  /**
   * Switch between Spectrum and Playlist view
   */
  private final void toogleSpectrum()
  {
      if (isSpectrumShown)
      {
        //remove(spectrumPanel);
        remove(awtCanvas);
        add(lastFileView, BorderLayout.CENTER);
        awtCanvas.donotShow();
      }
      else
      {
        remove(lastFileView);
        switchView();
        //add(spectrumPanel, BorderLayout.CENTER);
        add(awtCanvas, BorderLayout.CENTER);
        awtCanvas.showAgain();
      }

      isSpectrumShown = isSpectrumShown ? false : true;
      revalidate();
      updateUI();
  }

  private final void switchView()
  {
      if (lastFileView.equals(playlistPanel))
      {
        lastFileView = serverPanel;
      }
      else
      {
        lastFileView = playlistPanel;
      }
      System.out.println("New View:" + lastFileView);
  }


}

 
  public void showAgain()
  {
      canvas0.setVisible(true);
      canvas0.addNotify();
  }
  
  public void donotShow()
  {
      canvas0.setVisible(false);
      canvas0.removeNotify();
  }

    try
   {
          Sequence midi = MidiSystem.getSequence(new File("Blue_Monday.mid"));
          Sequencer player = MidiSystem.getSequencer();

          player.open();
          player.setSequence(midi);
          player.start();
   }
   catch (IOException e) 
   {
         e.printStackTrace();
    }
    catch(InvalidMidiDataException e)
    {
         e.printStackTrace();
    }
    catch(MidiUnavailableException e)
    {
         e.printStackTrace();
    }
  }

public FloatBuffer FSOUND_DSP_GetSpectrum()

<property key="java.library.path" value="."/>

    class.getClassLoader().getResourceAsStream(ref);

GL14.glBlendEquation (GLXX.GL_FUNC_ADD);