VideoStudio :: SmartSound / Controlling Audio Levels?

I have VS4 and yesterday worked on a project with a music track and a voice-over. I created a track I liked using SmartSound, the automated music track creation app that comes with VS4 (and there's a version for VS2 & VS3 as well). A few seconds after the music track started, I wanted to dip the level so that I could insert a voice-over, but there was no way I could figure out to reduce the music level just during the voice-over. I had to reduce the level of the entire SmartSound track so that you can hear the voice-over above it.

I could have created multiple SmartSound tracks for this, using normal volume before and after the voice-over, and reducing the level during the voice-over. But that would create music that didn't flow as a continuous piece, and I like the continuous track.So... is there any way to change the level in the middle of a SmartSound track? I would normally click on the track in the timeline, split it into segments, and set the levels for each segment. However, the SmartSound track wouldn't let me do that.