This project involves constructing an apparatus that mounts to a standard player piano mechanism in place of the paper piano roll and allows MIDI files to be played on the instrument. While modern player retrofit kits exist using solenoids, these need to be directly installed onto the piano action by an experienced technician. Additionally, installing such a kit on a player piano necessitates removing most, if not all of the original player mechanism. For my project, I aim to construct a portable device that can be easily installed by any individual on any functioning player piano. This will not only reduce the cost and effort required to update the piano, but it will also preserve its originality whilst giving it the ability to play MIDI files.