Sometimes, when people use voice the music volume goes down. This is a Windows issue. Here are the following steps to fix it.
1. On the bottom right of your toolbar where the speaker is, right click on it.
2. After you right click, choose 'Playback devices'
3. A new window will appear. Click on 'Communications'.
4. Once you clicked on Communications, you will see four choices, click on 'Do Nothing', then click Apply and Ok.