Different volume levels between audio- and videofiles

Was this resolved? I'm currently working on a 3+ hour course full of video and audio files. All narration (both video and audio) was done as videos in the studio on the same day. It was easier for the director and actor to shoot video for everything and pull audio directly from the video. Audio files for every video were given to me, and when I play them on the computer, the audio and video sound identical, as expected. However, the video volume is slightly higher than the audio when they are put into Storyline. It's not a wildly dramatic difference, but it is noticeable.

Considering the size of the course, it is not practical to manually adjust the volume of every video or every audio file. I have played with the compression of the videos, testing out both "Automatic" and "none," but it doesn't change the volume of the videos.

Considering the size of the story file, it is also not practical to upload all audio as an off-screen video.

I'm hopeful that there was a resolution for this and that there's a simple solution!