I'm using a basic Sorensen Squeeze 6 compression setting, 360p and it keeps knocking my audio out of synch with the video. I don't understand because the basic .mov file is fine. Once I compress it, it' s out. I made 3 other short clips out of the same footage and even duplicated the sequence. The other videos are fine. But this one is off and I don't get it. Anybody have any ideas?