iMovie question

[a l a n t h o m p s o n]

Hey, so I'm editing some video, and adding my own music by importing 
mp3s from my collection.  Everything is going swimmingly, except that 
when I edit the sound clip to cut a large portion out of it, there is 
still a rather large section of the sound clip that is left behind, 
albeit a different color, and without sound (as expected).

The problem is that when I go to add another mp3 clip just after, or 
shortly after the end of the first clip, it becomes very difficult to 
see what's going on due to the left over, edited portion of the first 
clip.

I know that I can move one of the audio clips up to a different level, 
but after the second clip this may no do the trick.  I recall that in 
iMovie 2, the behavior was different - when cutting a portion of an 
audio clip, it sized the clip down in length, leaving nothing behind.

Is there any way of changing this behavior?

thanks

--alan