I would suggest to give voice assistance in exclusive mode. In case of workout and music player running the voice assistance overlap with music and is not understandable some time
I personally like this way, without music interruption
If you use Google TTS, in advanced settings you can choose to ear the voice louder than music
Keyboard and input
TTS GOOGLE settings
Still not able to control voice volume in miui 9 interface. anyone with a xiaomi phone can guide me?