Channel Spectral Display

- Adds Channel Spectrum tab to display FFT of the audio output of the currently selected channel
 - Upgrades to JTransforms 3.0 FFT library
 - Adds three new context menus to main and channel spectral displays:
   -- Baseline - affects the vertical rendering baseline of the FFT
   -- Amplification - affects the vertical height of each FFT bin
   -- Averaging - affects how many FFTs are averaged to produce the display

src/spectrum/SpectralDisplayAdjuster.java

@@ -0,0 +1,55 @@
+package spectrum;
+
+public interface SpectralDisplayAdjuster
+{
+	/**
+	 * Gets the amplification multiplier that is applied against the FFT bin 
+	 * results when displaying the value in the spectral display.
+	 * 
+	 * @return amplification value ( 1 - 100 )
+	 */
+	public int getAmplification();
+	
+	/**
+	 * Sets the amplification multiplier that is applied against the FFT bin
+	 * results when displaying the value in the spectral display.
+	 * 
+	 * @param amplification value ( 1 - 100 )
+	 */
+	public void setAmplification( int amplification );
+
+	/**
+	 * Gets the averaging value indicating the number of FFT results that are
+	 * averaged to produce each FFT results output.
+	 * 
+	 * @return averaging value ( 2 - 50 )
+	 */
+	public int getAveraging();
+	
+	/**
+	 * Sets the averaging value indicating the number of FFT results to average
+	 * when producing an FFT output result.
+	 * @param averaging value ( 2 - 50 )
+	 */
+	public void setAveraging( int averaging );
+
+	/**
+	 * Gets the baseline used when plotting the FFT bin results in the FFT
+	 * spectral display.  This value determines the vertical position within the
+	 * spectral display upon which the amplified values are added and then 
+	 * plotted.
+	 * 
+	 * @return averaging value ( 1 - 50 )
+	 */
+	public int getBaseline();
+	
+	/**
+	 * Sets the baseline used when plotting the FFT bin results in the FFT
+	 * spectral display.  This value determines the vertical position within the
+	 * spectral display upon which the amplified values are added and then 
+	 * plotted.
+	 * 
+	 * @param baseline value ( 1 - 50 )
+	 */
+	public void setBaseline( int baseline );
+}