To embed sound files into your PDF
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Choose the 
Sound tool from the Advanced toolbar.
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Select a page area.
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Specify Content Settings. This includes
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Media compatibility: choose compatibility level
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Location: browse to the file to be added
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Content type: set application or audio type.
Mark the checkbox Embed content in document to save the added file into the PDF.
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Choose to have a cover for the audio content, if desired.
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Click OK.
Use the Hand tool to play the audio file and to add the current PDF to the list of trusted documents.
To modify multimedia settings, actions and appearance, select the Sound tool again, right-click the embedded content and choose the desired command.
If you do not embed the sound file, it is linked – both the PDF and the sound file must remain in their locations for the link to work.
You can also attach a sound as a comment.
