How do I convert an Adobe pdf file with sound assist for the visually impaired to use the keyboard to play audio?

I am trying to convert an Adobe pdf article file with a play button to an iTunes or other accessible file for people with visual impairments.  The file has been converted to a format that has a play button; however, the computer does not have a keyboard stroke that leads to the play button.  In other words, the play button isn't integrated into the accessible format; only sighted people can access the play button.  The individual is using an Apple laptop.

Can someone help me please?

Thanks!