When you think of the most important tool in a mastering engineer’s arsenal, what comes to mind? An equalizer? A compressor? Top-notch conversion, monitoring, or room acoustics? These are all certainly very important, but without a great set of ears behind them, they’re virtually worthless. In this article, Ian Stewart from iZotope looks at how with 5 exercises and some practice we can train our hearing to be like a mastering engineer.