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Audio Stereo

Audio Stereo · screenshot coming soon

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What this node does

Audio Stereo applies one of seven stereo-field operations to a track, using the matching FFmpeg filters (stereowiden, extrastereo, crossfeed, haas, stereotools, pan). You pick a mode and adjust only the parameters that belong to it. 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 (FFmpeg does the work). If no source is wired, it emits just the fx_spec for chaining. To feed native ComfyUI AUDIO in or out, insert a Bridge — see bridges.md.

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When to use it

  • Widen a flat stereo mix so it fills the speakers.
  • Tame overly-wide material with crossfeed for comfortable headphone listening.
  • Collapse to mono to check phase, or swap L/R to fix a reversed recording.

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Parameters

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mode

Which operation to apply. Options: widen (default), extrastereo, crossfeed, haas, balance, mono, swap. mono and swap have no extra parameters.

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Widen (sw_*)

  • sw_delay — delay in ms, 1–100 (default 20).
  • sw_feedback — feedback amount, 0.0–0.9 (default 0.3).
  • sw_crossfeed — cross-feed amount, 0.0–0.8 (default 0.3).
  • sw_drymix — dry mix, 0.0–1.0 (default 0.8).

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Extra Stereo

  • es_m — stereo expansion factor, -10.0 to 10.0 (default 2.5). Values above 1 widen; below 0 invert.

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Crossfeed

  • cf_strength — crossfeed strength, 0.0–1.0 (default 0.2).
  • cf_range — soundstage range, 0.0–1.0 (default 0.5).

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Haas

  • haas_side_gain — side channel gain, 0.06–12.0 (default 1.0).
  • haas_left_delay — left delay in ms, 0.0–40.0 (default 2.05).
  • haas_right_delay — right delay in ms, 0.0–40.0 (default 2.12).

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Balance

  • balance — L/R balance, -1.0 to 1.0 (default 0.0), fed to stereotools balance_out.

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Outputs

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Tips

  • Only the parameters for the selected mode matter — the rest are inert.
  • Very wide extrastereo values can cause mono-compatibility problems; check in mono mode before committing.
  • swap and mono are pure channel-math with no tunable knobs — instant fixes.
  • Audio Modulation — chorus/flanger can also add perceived width.
  • Audio Analyze — check loudness/levels after reshaping the field.
  • FX Chain — renders multiple fx_spec steps (including this one) in a single pass.