Everything we listen to has acoustical elements to it. Recall our discussion of reverb: Reverb is a simulated acoustic environment created to make your mix sound more spacious, and it can give the effect of being in a certain type of venue (for example, a church or a canyon). Reverb is in everything we hear, and sounds would seem very alien without it. If you listen to an in-ear mix, you can get an idea of what it’s like. It can be hard to work with, because we're used to hearing sounds interacting with their surrounding environment.