I'm doing the trial for Sony Vegas Pro 9 so I'm really clueless as to what I'm doing. I want to replace the audio in a video with a song. I already took away the original audio from the video and added the song but when I play it back, the video plays but with no sound. Alone, the audio works fine but when I put it with the video, it doesnt play. Any ideas of how to fix it? sry if this has been asked before and thanks for the help!