inserting soundtracks in pdf that play automatically when the pdf is opened

Hi,

I am trying to insert an audio to a pdf that plays automatically plays when the pdf is opened (with Adobe). I am using Adobe Reader on a PC.

I could do it manually (Comments - Record Audio), but I cant get it to work automatically (i.e. without clicking on the audio symbol)

Is there anything I can do in the preferences I can do to change this?

Thanks,

Kish