推荐回答（5个）
1、第一步，如下图所示，选中PPT第一页，点击工具栏“切换”--“声音”。
2、第二步，点击“声音”选项旁边的小按钮，如下图所示，选择“其他音乐”。
3、第三步，在跳出的选择框中，插入需要的音频文件。
4、第四步，如下图，点击“播放下一段声音之前一直循环”，到此就完成了全部设置。
在自定义动画中找到音乐的动作，打开效果选项，将计时里面的“重复”修改就可以了
右击小喇叭，自定义动画，效果选项-计时选项卡，选择“重复”项中的“直到幻灯片末尾”。就行了。
右击小喇叭，自定义动画，效果选项-效果选项卡，在停止播放中设置到超过你幻灯片数量的个数就行了
2007版本的PPT，解决办法：
在编辑界面双击喇叭播放按钮；
勾选“循环播放，直到停止”
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