Really need help with a simple animation/audio willing to pay

I have this simple animation (or so I thought) involving sound.

It’s a letter animation that has a sound file attached to it. The sound is suppose to fade out at the end of the animation. Instead it does something else and ends abruptly.

I’m willing to pay via Paypal to anyone who helps me solve this annoying little trick.

I am trying to do this:

Text animation starts and plays the audio, then the sound fades out (quiets down gradually) towards the end of the text animation. End of story.

The fla can be donwloaded here: