The alert sound didn't play for me for some reason.
I fixed it by making this change on line 3669...
From
Toelse if (PlayOnMatch)
{
String tempstr = AudioFile.Replace("\\", "\\\\");
Play(tempstr);
}
else if (PlayOnMatch)
{
//String tempstr = AudioFile.Replace("\\", "\\\\");
Play(AudioFile);
}