Sound is disabled even if java.applet.AudioClip.loop is called
in Java Applet.
 
 This happens with the following steps. JDK 1.3.1 is used.
 1. Get java applet to sound on Windows with AudioClip.
 2. Then stop the sound with AudioClip.stop().
 3. Leave the system for about 4 hours without do anything.
    (java applet is still alive during this.)
 4. Get the applet to sound on windows again with AudioClip.

 At the step 4, AudioClip doesn't make any sound. The sound
seems to be disabled.