Pre-Roll, Post-Roll sound file insertion

This is a long-shot, but I am supporting a website for a local community-run radio station. They have about 200+ shows and would like to insert a "pre-roll" announcement before each feed request. I see that it is possible with jPlayer, but the question is figuring out where in the code of the module I could add this. I'm new to Drupal module development, so I have no idea how this might work, but it would be a good start to add a field to the jPlayer module admin interface that allows one to select a pre-roll file that can be played before each recording is played. Sounds kludgy but maybe there's a way to just add the file information to the variable table as a path. I'd really like to be able to work with a developer to come up with this solution so I can learn how it works and be able to contribute back, but I can't figure out where to hook into the module to even do this without a UI.