Mixing therefore does not necessarily include worrying about the final volume level, dynamic range, stereo image width, or any concerns about how it might sound on the many different playback systems listeners may be using. Those will all be taken care of in mastering, when we look at the song as a whole and how it will be presented to the world. Mastering is the set of processes aimed at the final combined stereo output after all the mixing work is finalized. I split the MIDI wherever I felt an intuitive phrase boundary and arranged my drum loops accordingly. I doubled the synths with softer and more sustained sounds in a few sections as well.