On my computer, the the voices sounds very low and is drowned out by the music unless the main volume is set low. Any way to make the audio more synced to the music?

I would like to know also! I´m having the same problem!

I just tried it on my PC and I had no trouble. The music volume was lowered automatically when the narration began. You might have to look at your PC's audio settings and see if you can change something there.