My friend just bought a new imac, I am helping him make a movie for his students, when we edit we realized that we will have to do the video first then a seperate audio track so it syncs up. Can we just use the cam & talk into it not caring about the video to make the audio track or do I have to record it someother way? Can I import video and just use the audio off of it with another video track above it? Let me know...