Here's how it works.
Most music is made up of many instuments played in rhythm and harmony with one another.
In the recording studio, these instruments are recorded onto separate tracks. These tracks are then individually mixed and re-arranged to create the final product, a song. DoReMedia's approach is to leave these songs in their un-mixed format, essentially turning the multimedia designer into the recording studio producer. For effective synchronized multimedia, the developer needs as much control to shape the soundtrack as to shape the visuals. Pre-recorded production music tracks don't provide this flexibility.