OK, I think I understand what you want to do.
The first thing you need to do is separate the audio from the Video.
You do that in the Media library by Right click > Extract Audio. You right click the video you want to separate the audio.
That makes a WAV audio file.
Then you put (drag) that WAV audio to the Music track, and lock that track. By locking the audio track, you can do just about anything in the video track without the audio moving.
After putting the audio on the music track, Right click a clear area (at the end of video track) Mute Track. The removes the sound from the video track. It does not delete the audio track, it just silences it.
Now you can put in transitions without the audio moving or splitting.
That should keep the lip sync.
This message was edited 1 time. Last update was at Dec 03. 2011 09:09
Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.