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Audio Crossfade

Audio Crossfade · screenshot coming soon

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What this node does

Audio Crossfade joins two audio sources (A then B) with an overlapping fade: A fades out while B fades in over a set duration, giving a smooth transition instead of a hard cut. It is the audio equivalent of a dissolve between two shots. Each side accepts a COMFYTV_AUDIO snapshot, or a COMFYTV_VIDEO whose audio track is used (audio input takes priority when both are wired). It outputs a single COMFYTV_AUDIO snapshot and has a ▶ Run (FFmpeg does the blend). To feed native ComfyUI AUDIO in or out, insert a Bridge — see bridges.md.

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When to use it

  • Stitch two takes or songs together without a jarring seam.
  • Crossfade a music bed into the next section for a DJ-style transition.
  • Smooth over an edit point between two dialogue recordings.

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Parameters

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duration

Length of the fade, in seconds. Range 0.01 to 60, default 1.0. Longer gives a more gradual blend.

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curve1 / curve2

Fade shape for the out-fade of A (curve1) and the in-fade of B (curve2). Default tri (linear triangular). Options are the FFmpeg afade curves: tri, qsin, hsin, esin, log, ipar, qua, cub, squ, cbr, par, exp, iqsin, ihsin, dese, desi, losi, sinc, isinc, nofade. qsin/hsin sound more natural on music; tri is a safe default.

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overlap

When on (default), the two clips overlap during the fade (a true crossfade), so total length is roughly A + B − duration. When off, A fades out and B fades in back-to-back without overlap.

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Outputs

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Tips

  • Keep duration shorter than either clip — you can’t overlap more audio than exists.
  • For music, try qsin or hsin on both curves; the linear tri can dip in perceived loudness at the midpoint.
  • Audio Mix — layer up to four tracks at once with gain and pan, rather than joining two in sequence.
  • Audio Split Export — the inverse: cut one track into multiple segments.