Stop the background music in the slide when playing:

1. Open your own PPT file, select the shape under the Insert menu item, and then select the custom button.

2. Add the stop word to this button.

3. Select the animation in the menu bar above, and then select the animation pane to see the playing animation with added sound.

4. Click the sound icon, then click Add Animation, and select Stop in the pop-up menu.

5. At this time, you can see the stop animation effect of adding this sound in the animation pane on the right.

6. Double-click the sound playing list in the animation pane, select timing, select the effect to start when clicking the following objects in the trigger, and then select the button that we want to control sound playing. At this point, the background music in the slide is successfully stopped during playback.