noun
premastering
Technical term in audio/video production: the stage before final mastering where tracks are prepared and optimized.
プレマスタリングの段階で音量を調整する。
Adjust the volume during the premastering stage.
マスタリング is the final mastering process, while プレマスタリング is the preparatory step before it.
Borrowed from English 'premastering'.