Why did the concert showing the location of Tik Tok video become a sound effect?

This is the reason for applying your own design.

This phenomenon is the design specification of live audio and video applications in Tik Tok. When the application is cut to the background, the live video is allowed to continue playing sound. For applications that are playing audio in the background, such as music and live broadcast, in order to ensure the experience and consistency, the task manager cleans up the background programs with one click, and does not clean up such application processes, so it is necessary to clean up the applications separately.

Acoustic effect refers to the effect created by sound, which refers to the noise or sound added to the vocal cords in order to enhance the realism, atmosphere or dramatic information of a scene.