In the last lesson we assembled three silent video clips into a movie that included a transition effect. In this lesson we will learn how to add and/or modify sounds.

Let's add some music to our movie. Double-click the empty part of the project window and then add the file Music.aif to the project - you will find the file in the same 'Tour' folder that you got the other files from. Double-click the speaker symbol or drag the name of the file into the source view of the monitor window, then click the play button or press the space bar to listen to the sound (you'll need to borrow headphones if you are working in the CIV computer rooms). Now drag the file from the project window into audio track 1, making sure that it is slid as far as possible to the left of this track. Make the target view or the timeline active then press the space bar to play the movie with sound. You'll notice that the sound continues long after the movie has finished. Use the previous edit/next edit buttons to locate the frame where the FastSlow clip ends, then choose Edit>Razor at Edit Line. Note that what used to be a single audio clip has now been split into two audio clips. Make sure the selection tool is selected then click the second audio clip and press the delete key to delete it. Now when you play the movie you will find that the music ends just as the video ends (though it may not sound that great).

By the way, you may have noticed that there are other razor options - you can choose the razor tool or the multiple razor tool (press the tool icon and drag to switch between these two tools). The razor tool splits a single clip (or a linked pair of video and audio clips) while the multiple razor tool splits all the tracks that appear in the clicked frame. However, if it is important to use the razor at a precise point in the timeline then I recommend the menu item Razor at Edit Line since this makes it easier to locate the desired point.