Sound mastering involves several very matured audio techniques, It enhances, prepares your final audio mix for CD replication and Duplication. Audio mastering is a method of sound post production. It's the routine of apportioning and adapting your auditory form a source that contains your final audio mix to a data storage device and that's the master. The master is the final source of all the copies that will be replicated. Audio mastering involves the source material at its elementary sample rate and bit depth and is processed using noise reduction, equalization, compression, limiting, leveling, stereo enhancement, fated in and out, pre-gapping and other audio enhancements. Audio return processes can be applied, if needed, as part of our audio mastering process, but its usually not the norm as these things should be doen in the mixing footing of the process.