I'm looking for a plugin that make someone talk faster with not a higher voice
so the voice over is in sync with the story
exist a plugin like that, I work in the avid MC 5.5.3
I hope someone understands my clumsy enlish
One is to shorten the gaps between words slightly. The difficulty of doing that on an Avid (or any other NLE designed for cutting pictures) is that you don't have fine enough editing - you really need to cut at the sample level and video editing systems can only cut at points one frame apart, so you can do a fair amount that way but it's a bit limited. I don't know of any plugin for Avid for that kind of job, you really have to go into an audio editing system to do it properly.
The other way is to speed up the audio, using pitch correction to stop the voice going high pitched. There are plug-ins for that (look for "Time Compression Expansion" in your Audio Suite set, MC 5.5 should have come with it already included). The catch with that is that any more than a few percent speed up will sound obviously processed - the human ear really notices anything odd about the voice (more than most other sounds that we encounter).
I sometimes use the first technique (trimming out the gaps) when the difference is relatively small, but more often I'll alter the picture cut to make room for the narration. If you really need the voice to match a cut picture sequence the way to go is to voice to playback, then you can tell at the time of recording whether you need to talk faster, change the script to reduce the number of words or alter the picture cut to get it in.