If a student completes or submits a take, and wants to listen back, but either had the accompaniment off or headphones on to help with assessment, they should be able to add in the accompaniment track while they listen.
When they submit an assignment it also only submits their recorded part (not the background). Music is an aural art form and in order to be able to judge dynamics and tempo and such, I need to be able to hear the background music as well as the student submission.