1. First open the vivoX9 music player to play music in it, and set the music player to smart mode.

2. Secondly, this is the music played by the music player. It is always on top. When there are other sounds, the music can also be played normally.

3. Finally, open the online course in the online course software, click Play, and set it to headphone mode. At this time, the voice will be played with a smaller sound.