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Another (non-JLayer) way to adjust the PC's speaker volume is to use classes in the javax.sound.sampled package provided by Sun/Oracle. On my machine, SPEAKER was the only output target supported. <pre><code>import javax.sound.sampled.AudioSystem; import javax.sound.sampled.FloatControl; import javax.sound.sampled.Line.Info; import javax.sound.sampled.LineUnavailableException; import javax.sound.sampled.Port; public class SoundVolumeDemo { public static void main(String[] args) { Info source = Port.Info.SPEAKER; // source = Port.Info.LINE_OUT; // source = Port.Info.HEADPHONE; if (AudioSystem.isLineSupported(source)) { try { Port outline = (Port) AudioSystem.getLine(source); outline.open(); FloatControl volumeControl = (FloatControl) outline.getControl(FloatControl.Type.VOLUME); System.out.println(" volume: " + volumeControl.getValue() ); float v = 0.33F; volumeControl.setValue(v); System.out.println(" new volume: " + volumeControl.getValue() ); v = 0.73F; volumeControl.setValue(v); System.out.println("newest volume: " + volumeControl.getValue() ); } catch (LineUnavailableException ex) { System.err.println("source not supported"); ex.printStackTrace(); } } } } </code></pre> This is how I am achieving volume control in this app: <a href="http://onebeartoe.com/media-players/randomjuke/filesystem/java-web-start/swing/index.jsp" rel="nofollow">http://onebeartoe.com/media-players/randomjuke/filesystem/java-web-start/swing/index.jsp</a> Please note that I have only had experience with it working on MS Windows OS machines.
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