Well in this thread :
it says and i quote : "hysteria isnt missing a sound rom now thanks @loo" , so i download the roms in this thread for hysteria, but no instructions there. Until now i can't get the sound to work. I tried to add the "new" rom through the rom manager, but nothing happens apart from a few weird noises. So i don't know if it is correct or not, but it said so in that thread.
Maybe @loo knows how to activate the sound, because he/she provided the roms.