An exponential fade-out curve is often smoother and more realistic than a linear fade

When making a fade-out, the temptation is to use a linear curve, but the book notes an exponential curve is sometimes smoother and much more realistic sounding. Producing smooth fades — rather than just applying any fade — is one of the main elements of professional mastering; the mastering engineer is frequently called on to do or fix the fade so it sounds natural.

Examples

A linear fade may sound uneven; switching to an exponential curve for the same duration produces a fade that sounds even and gradual. Bob Katz notes you can even supply artificial decays with a little reverb and a careful crossfade indistinguishable from real life.

Assessment

When making a master fade-out, which curve type does the book prefer for a smoother, more realistic result, and why does fade quality matter in mastering?