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    <p>Have a look here: <a href="http://potatoland.com/openjava/demo/Sound.java" rel="nofollow noreferrer">Openjava sound demo</a><br> They use <code>FloatControl gainControl; // for volume</code><br></p> <pre><code>/** * Set the volume to a value between 0 and 1. */ public void setVolume(double value) { // value is between 0 and 1 value = (value&lt;=0.0)? 0.0001 : ((value&gt;1.0)? 1.0 : value); try { float dB = (float)(Math.log(value)/Math.log(10.0)*20.0); gainControl.setValue(dB); } catch (Exception ex) { ex.printStackTrace(); } } /** * Fade the volume to a new value. To shift volume while sound is playing, * ie. to simulate motion to or from an object, the volume has to change * smoothly in a short period of time. Unfortunately this makes an annoying * clicking noise, mostly noticeable in the browser. I reduce the click * by fading the volume in small increments with delays in between. This * means that you can't change the volume very quickly. The fade has to * to take a second or two to prevent clicks. */ float currDB = 0F; float targetDB = 0F; float fadePerStep = .1F; // .1 works for applets, 1 is okay for apps boolean fading = false; public void shiftVolumeTo(double value) { // value is between 0 and 1 value = (value&lt;=0.0)? 0.0001 : ((value&gt;1.0)? 1.0 : value); targetDB = (float)(Math.log(value)/Math.log(10.0)*20.0); if (!fading) { Thread t = new Thread(this); // start a thread to fade volume t.start(); // calls run() below } } /** * Run by thread, this will step the volume up or down to a target level. * Applets need fadePerStep=.1 to minimize clicks. * Apps can get away with fadePerStep=1.0 for a faster fade with no clicks. */ public void run() { fading = true; // prevent running twice on same sound if (currDB &gt; targetDB) { while (currDB &gt; targetDB) { currDB -= fadePerStep; gainControl.setValue(currDB); try {Thread.sleep(10);} catch (Exception e) {} } } else if (currDB &lt; targetDB) { while (currDB &lt; targetDB) { currDB += fadePerStep; gainControl.setValue(currDB); try {Thread.sleep(10);} catch (Exception e) {} } } fading = false; currDB = targetDB; // now sound is at this volume level } </code></pre>
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