Having problem adding typewriter sound to typewriter code

Question

For the typewriter effect, I'm trying to add a typewriter "click" sound every time this function (within a class) writes a letter:
    private function setLetter(n:Number)
            var correctLetter:String = text.charAt(n);
            var part1:String = text.substr(0, n);
            temp_text = part1 + correctLetter + cursor;
            textfield.htmlText = temp_text;
When I add the lines below, the audio still isn't working (PS. I renamed the Class ID on the .wav file "sound55")
            var my_sound:sound55 = new sound55();
             var my_channel:SoundChannel = new SoundChannel();
             my_channel = my_sound.play();
It now reads
    private function setLetter(n:Number)
            var my_sound:sound55 = new sound55();
            var my_channel:SoundChannel = new SoundChannel();
            my_channel = my_sound.play();
           var correctLetter:String = text.charAt(n);
            var part1:String = text.substr(0, n);
            temp_text = part1 + correctLetter + cursor;
            textfield.htmlText = temp_text;
Can anybody tell me what is wrong with the three lines of audio "code"?

Answer 1

there's nothing wrong with your code assuming that's in a document class and sound55 is the class name of your sound.