Control Timeline Volume

I’m doing a slideshow. I have sound playing in the timeline of each slide.

The slides move from a “nowplaying” movie clip to “lastviewed” movieclip (which are droptargets). In short, this keeps the animation going while transitioning to the next if the user decides to advance in the middle of a slide. So far, everything is working smoothly except for the audio. How would i be able to set the volume to 0 when the movie clip gets attached to the “lastviewed” drop target. This way, the animation continues on it’s way out and the sound from the next clip can play with nothing over top.