How to Crossfade Two Songs

Equal-power vs. linear crossfade curves

A linear crossfade fades the outgoing clip down and the incoming clip up along a straight line. It is simple, but it has a known problem: because loudness does not add up in a straight line when you sum two independent audio signals, a linear crossfade often produces an audible dip in perceived loudness right around the midpoint, where both signals are at roughly half amplitude.

An equal-power crossfade uses a curved fade shape instead of a straight one, designed so the combined perceived loudness of the two overlapping signals stays roughly constant through the transition. That dip largely disappears. Equal-power is the more natural-sounding default for most music transitions; linear can still be useful for short, simple fades where the dip is barely noticeable, or when you want a more mechanical, obvious edit point.

The difference is usually easiest to hear on a longer crossfade, five seconds or more, where a linear curve gives the overlap a brief, audible sag in the middle before the incoming song takes over. On a very short crossfade, a second or two, the two curves tend to sound close enough that the choice matters less.

How long should a crossfade be?

There is no single correct length — it depends on tempo and genre, since a crossfade essentially overlaps a chunk of both songs' rhythm and harmony at once. A shorter crossfade covers fewer beats at a fast tempo, while the same length at a slow tempo covers far more musical material and risks feeling muddy.

Trim before you crossfade

If either song has dead air or silence at its start or end, trim it off first with the audio trimmer before adding it to the joiner. A crossfade that begins during a few seconds of silence wastes part of the transition and can sound like an unintentional gap rather than a deliberate blend, especially at shorter crossfade lengths where every second counts.

Matching loudness before you blend

Two songs mastered at different loudness levels will make a crossfade sound like a volume jump rather than a smooth handoff, no matter how good the curve is. The audio joiner's optional loudness matching brings clips to a common target of −16 LUFS automatically before mixing them, which handles most cases without any manual work. For finer control — say, one track just needs to come down slightly rather than being fully re-matched — use the per-clip gain control instead, adjustable up to ±12 dB per clip.

When to use a silent gap instead of a crossfade

Not every transition between two songs should blend. The audio joiner also offers a silent gap, from 0 to 10 seconds, as an alternative to a crossfade, and it is worth reaching for deliberately rather than defaulting to a crossfade every time. A short silent gap suits a mixtape or playlist style where each song should feel like its own distinct moment, or where the two tracks have very different tempos, keys, or energy levels that would sound jarring blended together rather than separated.

A crossfade works best when the two songs share some musical common ground — a similar tempo, a compatible key, or at least a smooth dynamic shift from one to the other. When they do not, a clean cut or a brief silent gap is often the more honest choice, rather than forcing a blend that fights itself in the overlap.

Handling different sample rates

It is common for two songs from different sources to have different native sample rates. The audio joiner handles mixed sample rates automatically when you combine clips, so you do not need to convert either file to match the other before you start building the crossfade.