reading a post attachment on the backend

Need some help any input would be great.

I’m working on a theme, where every post will have an audio file attached to it. I’m using MediaElement.js as the player.

I’ve tried to just insert the audio into the post via the [audio] tag but not getting the results I want.

I want to plug the MediaElement.js player code into the page.php section for the post. Have that code grab the attached audio file for each particular post. My problem is, not sure how to grab the attached file, then have the player use it. The [audio] tag can still be used but I need to use it on the backend.