Yeah if only it were that easy, but it doesn't work. Those conditions are checked at the beginning of the turn, after you've killed an enemy it is considered the end of the turn. And so because the enemy was alive at the beginning of the turn, the sound effect is not played. Once the enemy dies, there are no more turns, so the condition is not tested again and therefore the sound effect is not played.
If there is anyone who has actually tried it and gotten it to work please let me know. Don't just post thinking that you know how to do it when you've never done it.
}:-)>