join audio with crossfade online
The Audio Joiner's crossfade sums the end of one track with the start of the next using an equal-power curve, sin(t·π/2) rising and cos(t·π/2) falling, instead of a linear ramp. The duration set on screen is never guaranteed at every seam: each overlap is capped at the smaller of the requested crossfade and the duration of the two neighbouring tracks, so one short track can shrink the crossfade on its own.
Since no block is shorter than the requested 5s, both overlaps come out at the full value, with no automatic cut.
The requested crossfade (3s) is never applied in full when a neighbour is shorter than it, here the 1.5s effect decides the real overlap on both sides.
That predicted 1.41x peak, not a bug, is exactly why the encoder applies a per-sample clamp.
Crossfade is a transition technique where the end of one track fades out while the beginning of the next fades in, creating a smooth overlap. It is ideal for continuous music mixes, soundtracks, or podcasts where abrupt cuts would sound jarring.
It uses equal-power: sin(t·π/2) for the fade-in and cos(t·π/2) for the fade-out. At the middle of the transition both gains equal 0.707, not 0.5, which avoids the volume dip a simple linear ramp produces at that point.
You can request it, but the real overlap is capped at the minimum between the requested value and the duration of each of the two neighbouring tracks. A 1.5-second effect between two 10-second blocks, with 3 seconds of crossfade requested, produces a real overlap of only 1.5 seconds on both sides.
Momentarily yes, the sum can reach about 1.41 times the amplitude of either track alone at that exact point, because both equal-power gains equal 0.707 at once. A per-sample clamp in the final encoder keeps that peak from exceeding the PCM's ±1.0 range.
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