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Audio Saturate

Audio Saturate · screenshot coming soon

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What this node does

Audio Saturate applies one of five distortion/saturation effects to a track, using the matching FFmpeg filters (asoftclip, apsyclip, acrusher, aexciter, crystalizer). 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

  • Warm up a sterile digital source with soft-clip or exciter harmonics.
  • Add aggressive grit or lo-fi crunch to drums or synths with bit-crush.
  • Push loudness without hard digital clipping using psychoacoustic clipping.

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Parameters

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mode

Which effect to apply. Options: softclip (default), psyclip, crush, exciter, crystalizer.

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Soft Clip (sc_*)

  • sc_type — clipping curve: hard (default), tanh, atan, cubic, exp, alg, quintic, sin, erf.
  • sc_threshold — clip threshold, 0.01–1.0 (default 1.0).

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Psy Clip (py_*)

  • py_clip — clip level, 0.015625–1.0 (default 1.0).
  • py_adaptive — adaptive amount, 0.0–1.0 (default 0.5).

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Crush (cr_*)

  • cr_bits — bit depth to crush to, 1–64 (default 8).
  • cr_mix — wet/dry mix, 0.0–1.0 (default 0.5).
  • cr_mode — lin (default) or log reduction.

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Exciter (ex_*)

  • ex_amount — effect amount, 0.0–64.0 (default 1.0).
  • ex_drive — harmonic drive, 0.1–10.0 (default 8.5).
  • ex_blend — harmonic blend, -10.0 to 10.0 (default 0.0).
  • ex_freq — cutoff frequency in Hz, 2000–12000 (default 7500).

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Crystalizer

  • cz_i — intensity, -10.0 to 10.0 (default 2.0). Positive sharpens; negative softens.

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Outputs

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Tips

  • Only the parameters for the selected mode matter — the rest are inert.
  • Start soft-clip at tanh/atan for musical warmth; hard is the most aggressive.
  • Bit-crush at high bit counts is subtle; drop toward 4–8 bits for obvious lo-fi character.
  • Audio EQ — tame or accentuate the extra harmonics saturation adds.
  • Audio Dynamics — pair with compression to control the added energy.
  • FX Chain — renders multiple fx_spec steps (including this one) in a single pass.