This is the same complaint that I have with Destiny 1 currently and I thought it will be resolved with Destiny 2, but it doesn't look like it.
Please add a separate volume control for music. The music is way too loud. It drowns out the voice acting, and it drowns out the game sound. I want to listen to the music, but because it is so loud, I'm forced to play with no music and that's disappointing for a game with such a great sound track.
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I’ve given up and keep music turned off. It’s a shame because D2 has some great music.