Syncing events attached to an audio track

I’ve been asked to create an idiot free flash animation where text scrolls from top to bottom while a narrator repeats what is displayed on screen.

Now for the twist. There are certain passages and keywords in the text that need to be emphasized when they are spoken by the narrator. The emphasis is just the text scaling up so it’s larger than the rest of the normal text.

I’ve never worked with audio in flash before, so what I plan on doing is placing the audio on stage and dragging the frames to fit the audio. Where there are the keywords and passages for highlighting, I’ll do a standard timeline tween to sync with the audio.

Is there a better way to do this? I have 8 of these animations to and was wondering do I have to brute force my way through it.

Thanks in advance