I can't hear any sounds when I browse java applets
in Netscape 4.61. I know the sound is set up correctly
on my Red Hat 6.0 system as I can run RealPlayer with
Java in Netscape 4.61 under Linux does not support sound, and I don't
believe Netscape (AOL) has any short-term plans to change this.
it may be possible to incorporate an add-on library to fix this. I am
looking into the problem further.
http://www.alumni.caltech.edu/~dairiki/libmmoss/this library can perhaps help you with your problem: