I am having trouble with the volume level of the music on my video. I have two separate songs for two separate portions of the video. The first song is copied several times to accommodate the length of the video it corresponds to. I have the volume of that song set to the lowest setting possible. The second song is set to mid-level (the default volume setting). When I play the video from any point during the first song, the volume of both songs stays very low. Please help!