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How to control the PowerPoint document pages of background music playback timeBut that is not the case, I have the following I will summarize in the actual operation of the realization in PowerPoint are two ways to insert background music to share with everyone (In this paper, PowerPoint 2003, for example, other versions please refer to operations). 1 Click Insert Movies and Sounds Sound from File (Figure 1), in the event of the Insert Sound dialog box, select the file to be used as background music, and then click OK (Figure 2), the pop-up dialog box click the Auto button to insert music object (Figure 3) 2 Right-click the inserted sound object (speaker icon), on the shortcut menu, select Custom Animation (Fig. 4), in emergence of the Custom Animation task pane, click the Music option just inserted under the right arrow to access the menu that appears, click the Effect Options (Figure 5) 3 in the pop-up Play Sound dialog box, in the Effects tab, in the stop playing item checked below in (F): XX slide after (XX is the middle number), increase or decrease the number in the middle box, enter the appropriate number ( Figure 6) figures can slide to set the total number of sheets, for example, a total of 49 slides, then you can set to 50, this can be achieved until the end of the slide did not reach the set number of sheets, so the sound it will not stop if you insert a sound file is relatively short, you can switch to the timing tab, in the repeat behind the drop-down list box, select Until the end of the slide item (Figure 7), so you can avoid hair because the sound file is too short, leading to later presentation without background music happening and do not forget to switch to the Sound Settings tab, check Hide sound icon during slide show item (Figure 8), so that the projection when the small speaker icon will not show up.