Mastering is an art which calls for expertise and experience. It is usually considered a not-so-important kind of procedure. But now the music frenzy population understands the important of sounds and music. This would mean that the music has to undergo perfection. Mastering is the process which adds the finesse to a soundtrack. It is the process which makes it compatible with every medium and not just the one on which the music is composed. When the soundtrack is played on a radio, the effect of mastering the song becomes obvious. Almost all types of tracks need mastering. Be it the normal leveling of the volume or the extreme eq or compression. The mastering engineer listens to the tracks and fine-tunes it. The trained ears of the mastering engineer are geared to find out the deficiencies in the soundtrack. The track is put through series of equipments, the effect of which is then measured by the engineer. The volume of the track is leveled and the gap between the sings is fixed. Online mastering services are now available to make mastering services more accessible to the people. The audio files can now be mastered online. This is done by sending the audio files to the mastering sites. Once the audio files are received, they are worked upon by the master engineer. The mastered files are then sent back to the client. This is a more economical and convenient way of getting your tracks mastered. The quality of mastering such audio files is in no other way lesser than that of attended mastering.