1. How to Add Sound to an Entire PowerPoint Presentation
  2. Step 1: Save the sound file.
  3. Step 2: Go to Slide Master View.
  4. Step 3: Insert Sound File.
  5. Step 4: Loop Sound.
  6. Step 5: Open Custom Animation.
  7. Step 6: Set End Slide.
  8. Step 7: Test your presentation.

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