It depends on how many audio tracks are selected to be displayed. As you chose extra tracks, they are compressed on your screen to make some room but you have to scroll down to see each track, whether it be video overlay or extra audio track. On PD8 I have two extra audio(music) tracks I can add as needed, but to see them, I need to scroll down as they are grouped together with the main music track, below the voice(narration) track. You may well be using a later version of Power Director, in which case, you'll likely have extra music tracks to work with, but as you open your project, you'll need to ensure that all your selected music tracks are shown by clicking on the icon to add more PiP or Music Tracks, that's the button to the right of the timeline/storyboard option in your editing area. Hope this was of some help. Cheers!