Thanks for your suggestions. Here’s what happened.
Tried speeding up the sound apart from the video, no difference.
Tried increasing the speed at different rates, as suggested 200% and so on, discover the max i can go without losing sound is 380%, which sounds more like what I want than at 200%. however there are gaps in between as sometimes the person is not talking, so i’m cutting and pasting sound from excess footage to get a consistence, squeaking sound to a few minutes of 1000% speed up video.
im not sure if the speeding up loses the sound because when i play the 1000% speed up video clip and stop and play along the timeline i get the high pitch sound everytime i stop and play again, along which ever part of the timeline. could be a software issue with FCP4