Note This workaround only works if the presentation uses slide timings to advance to the next slide.
- Open the presentation in PowerPoint 2010.
- Locate the slides with the transition sounds. On the Transitions tab, set Transition Sound to [No Sound].
- Under Advance Slide, note the slide duration time in the Automatically after box.
- On the Insert tab, in the Media Clips group, under Sound, click either Sound from file or Sound from Clip Organizer.
- Insert the sound that you want to play across the slide transition.
- Click Automatically when you are prompted.
- Under Sound Tools, click the Options tab.
- In the Sound Options group, select the Hide During Show check box.
- Under the Animations tab, in the Animations group, click Custom Animation.
- In the Custom Animation pane, right-click the sound file that is listed in the animations list, and then click Timing.
- Set the Start drop-down list to After Previous.
- In the Delay field, enter a value that is equal to the slide duration time minus 1 second. You noted the slide duration time in step 3. For example, if the slide advances after 40 seconds, you would set the Delay value to 39 seconds.
- Click OK.
- Repeat steps 2 through 13 for each slide transition that has a transition sound.