I have a question about using filmora. I currently use shadowplay for recording gameplay while many brother uses mumble to record a seperate vocal track and we put them in filmora edit and put the two recordings together. It's a great program but we are having an issue. After a while, the video starts separating from the vocal, so we will talk and a couple seconds later the action will happen in the video. What is causing the recordings to seperate from each other?