Songs not only use up system resources in terms of processing power and hard disk space, they also require RAM (memory) to load at all. The amount of RAM required for loading a song, is directly proportional to the amount of samples used in the song. For example, a song which uses only Subtractors and effects requires very little RAM.Note that this could affect sound quality negatively. Also note that it will require an external sample editor with good sample rate conversion facilities.