How to Do Professional Audio Fades in Mastering
Fades are one of those fundamentals that most producers get slightly wrong, and the result is track endings that feel abrupt or unnatural. Getting a fade right is simple once you know the shape and timing to use, and it makes a noticeable difference to how a track feels when it ends.
The Cosine Fade and Why It Works
The fade shape to use for the vast majority of natural track endings is a cosine fade, sometimes called an S-curve in certain DAWs. The cosine fade has a curved shape rather than a straight diagonal drop, which means the level comes down more gently at first and then pulls off more decisively as it approaches silence. This mirrors how natural sounds decay, which is why it sounds more organic than a linear fade.
A straight linear fade drops at a constant rate and tends to produce an audible click or unnatural cutoff at the bottom where the waveform abruptly hits silence. The cosine curve avoids this by easing out smoothly. It's a small difference but the ear picks it up, particularly on acoustic material or anything with reverb tails.
How Long Should a Fade Be?
For a natural fade-out on a pop or any melody-driven track, around 15 seconds is the sweet spot. This gives the track time to feel like it's coming down gradually without dragging. The fade should be set so that when the track reaches its quietest point, it still sounds like the song is continuing, not like it's just been turned off. The listener's brain should be finishing the phrase in their head while the track disappears.
Quick fades under five seconds tend to feel sudden and slightly jarring. They work for certain creative effects or for specific transitions between tracks on an album, but for the standard pop or commercial ending, the longer fade reads as more professional and intentional.
When to Use Other Fade Shapes
Creative fade shapes, fading in and then out again, or unusual curve types, are for deliberate production choices rather than standard track endings. If you're trying to create a specific effect with a fade, experiment. But if the goal is a natural, professional-sounding ending, the cosine fade at around 15 seconds handles the vast majority of situations correctly.
In mastering, the fade happens after all processing. You're not fading before the limiter, you're fading after the entire chain. That way the limiter doesn't change behaviour as the level drops, and the fade sounds consistent with how the track sounds at full volume.
A Practical Note on Fade Timing
Before digital audio workstations, fades had to be performed in real time by hand, often by a dedicated person with a steady touch and a feel for timing. The skill involved in doing a 15-second fade smoothly on an analogue desk while cutting to tape is not trivial. Digital has made this trivial by comparison, so there's no excuse for a bad fade. Set the shape, set the length, listen to the whole thing through, and adjust until it sounds like the track is being gently put to sleep rather than switched off.
FAQ
What fade type to use when mastering?
Cosine fade (S-curve). Curved shape that eases out naturally rather than a linear drop.
How long should a fade be?
Around 15 seconds for a standard natural ending. Long enough to feel gradual, short enough not to drag.
Fade before or after the mastering chain?
After. That way the limiters and compressors behave consistently throughout.
Why is a cosine fade better than linear?
It eases out naturally at the end rather than cutting off abruptly. The ear picks up on that difference.
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