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Audio Time / Pitch

Audio Time / Pitch · screenshot coming soon

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What this node does

Audio Time / Pitch re-times or re-pitches audio. In the fast FFmpeg modes it uses atempo, asetrate/aresample, and areverse. In the two HQ modes it uses a StaffPad-style phase vocoder that stretches time or shifts pitch without the “chipmunk” side effect of naive resampling. It takes a COMFYTV_AUDIO snapshot (or a COMFYTV_VIDEO, whose audio track is used) and outputs processed COMFYTV_AUDIO plus an fx_spec. It has a ▶ Run. The HQ modes require an audio input and refuse to run when the change would be a no-op. To feed native ComfyUI AUDIO in or out, insert a Bridge — see bridges.md.

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When to use it

  • Speed a clip up or slow it down while keeping the pitch natural (pitch_hq isn’t needed — use stretch_hq).
  • Transpose a vocal or instrument by a musical interval without changing its length (pitch/pitch_hq).
  • Reverse a track for a whoosh/riser effect.

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Parameters

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mode

Which operation to run. Options:
  • speed (default) — change tempo and pitch together (via atempo), like playing a record faster.
  • pitch — shift pitch by semitones while preserving length (resample + atempo).
  • pitch_hq — same, but via a phase vocoder for higher quality. Requires audio; errors if semitones = 0.
  • stretch_hq — change tempo only, preserving pitch, via phase vocoder. Requires audio; errors if tempo = 1.0.
  • reverse — play the track backwards.

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tempo

Playback speed multiplier, 0.25–4.0 (default 1.0). Used by speed and stretch_hq. 2.0 = twice as fast, 0.5 = half speed. Errors if left at 1.0 in those modes (nothing to do).

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semitones

Pitch shift in semitones, -24 to +24 in 0.5 steps (default 0.0). Used by pitch and pitch_hq. +12 = one octave up. Errors if left at 0 in those modes.

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Outputs

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Tips

  • speed is the fast, “record-player” behavior; use stretch_hq when you need to keep the pitch musical.
  • pitch (FFmpeg) is quick but can smear transients; pitch_hq sounds cleaner at the cost of processing time.
  • Only the FFmpeg modes produce a usable fx_spec for chaining — the HQ modes render directly.
  • Audio Modulation — vibrato for continuous pitch wobble rather than a fixed shift.
  • FX Chain — renders multiple fx_spec steps (the FFmpeg modes) in a single pass.