Keep Coding

I've been looking all over the internet trying to find a solution to my problem but I haven't found anything.
I need some help saving an audio file to a specified folder. If I was working with an image, I'd use a pixelReader to read over the original image and then a pixelWriter to write to a writableImage. However, with media, there doesn't seem to something similar.
I am working on a slideshow program that allows users to create, save, and load custom slideshows:
All of the images are rewritten, renamed, and stored locally so they stay in order and are easily retrieved. In between each image is a text file that contains the type of transition and the delay assigned to each image. I would like to be able to store the song inside of this folder. The images are added into the slideshow using the file chooser and i plan on doing that with the audio but I want the program to save the slideshow in the background so I can't simply copy and paste the file into the slideshow directory.
Sorry for the long description, I just wanted to make sure that my problem was as clear as possible.
Thank you!