Two ways to insert a sound file by using the slide placeholder.
You can use the icons that are part of some slide layouts to insert a sound file, too. The effect is the same — you are inserting a sound file, but you do it from within the slide instead of using the Insert tab. The slide must have a layout that includes a content placeholder, as shown in the picture.
The content placeholder is the area outlined by a dotted border on the slide. Your content goes within this border. When you see the icons, as shown here, you'll know that this placeholder can contain text or other things, such as pictures, sounds, or graphics.
Click the Insert Media Clip
icon to browse for sound files on your computer or a network server.
Click the Clip Art
icon to open the Clip Art task pane and search for sounds to insert.
The sound is inserted within the placeholder, in the form of a sound icon.
What are the benefits of this method? You may want the sound icon to always appear in a certain position on your slides. For example, if you created a self-running presentation in which a person had to click the sound icon on each slide, you might like the icon to be in the same placeholder and position every time.
Note that PowerPoint will still use content placeholders, if any are available, for an inserted sound even if you insert the file by using the Insert tab — and will put the sound icon in the middle of the placeholder. The content placeholder icons just give you a handy method for insertion and guarantee that the sound will be positioned in that spot.