I don't know of an automatic way to do it using a plug in, but there are fade in and fade out transitions in PremPro, don't know what the score is with Prem Elem. You could just zoom in to frame level and lock the tracks you don't want to edit and place cuts at the points where you want the music to fade down and the audio to fade up. Put a keyframe at the start set a 0.0 and then go to the end of the audio piece and place another keyframe and set it to infinity (where the audio fades out completely) - do the opposite when you want to fade the audio in.

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