To: paulamywood
Hello,
You can find out how to fade in/out video in AVS Video Editor reding
this topic. There is no special feature to syncronize video and audio in our software, however, you can extract audio of your video in Media Library (rightclick on video file> Extract Audio in the context menu), then mute sound of your video on Timeline (right click>Mute) and then fit extracted audio track to video putting it to Audio Mix line on Timeline.
Best regards.