[EvilLS1]

Jucin,
Add the code exactly as it is in the instructions.. It should look like this:

//new PM sound hack
if ($unreadpm['messages']==0) {
$sound='';
} else {
$sound='<embed src="message.wav" autostart="true" hidden="true">';
}
//end new PM sound hack

And make sure you added $sound to your forumhome_pmloggedin template.

If you've done that and uploaded message.wav to your forum directory then it should work.