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Muse Reverb (FDN)

Muse Reverb (FDN) · screenshot coming soon

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What this node does

Muse Reverb (FDN) adds artificial reverberation using a Feedback Delay Network — a bank of delay lines with feedback that produces a dense, natural-sounding tail without needing an impulse response. You control reverb time, room scale, pre-delay, the balance of dry/early-reflection/late energy, frequency-dependent decay, modulation, and stereo width. It takes a COMFYTV_AUDIO snapshot (or a COMFYTV_VIDEO, whose audio track is used) and outputs processed COMFYTV_AUDIO. It has a ▶ Run. A source is required. To feed native ComfyUI AUDIO in or out, insert a Bridge — see bridges.md.

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When to use it

  • Add hall, room, or chamber ambience to dry recordings without hunting for an IR.
  • Sit a vocal or instrument in a defined space with controllable size and decay.
  • Sculpt the reverb tone by making highs decay faster than lows (or vice versa).

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Parameters

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reverb_time_ms

Overall decay time (RT) in ms, 100–10000 (default 2200). Longer = bigger, more sustained space.

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room_scale

Size scaling of the delay network, 0.5–4.0 (default 0.8). Larger values spread the reflections out for a bigger room feel.

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predelay_ms

Gap before the reverb begins, in ms, 0–500 (default 10). Adds a sense of distance from the walls and keeps the dry signal clear.

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Levels

  • dry_db — dry (unprocessed) level, -60 to +6 dB (default 0).
  • late_db — late reverberation level, -60 to +6 dB (default -14).
  • er_db — early-reflections level, -60 to +6 dB (default -14).

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Frequency-dependent decay

  • time_low — low-band decay scaling %, 50–200 (default 100).
  • time_high — high-band decay scaling %, 50–200 (default 60). Lower = brighter highs die faster (more natural).
  • xover_low_mid — low/mid crossover Hz, 50–500 (default 400).
  • xover_mid_high — mid/high crossover Hz, 1000–10000 (default 4000).
  • feedback_top — top-end damping frequency Hz, 500–20000 (default 8000).

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Modulation & width

  • mod_freq — tail modulation rate Hz, 0–10 (default 1.0).
  • mod_amp — modulation amount, 0.0–1.0 (default 0.2). Adds subtle movement to avoid a static, metallic tail.
  • stereo_spread — stereo width %, 0–150 (default 100).

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quality

Network size: 8 or 16 delay lines (default 16). 16 is denser and smoother; 8 is faster.

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Outputs

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Tips

  • Keep the highs decaying faster than the lows (time_high below time_low) for a natural room; equal values sound artificial.
  • A little mod_amp (~0.2) stops long tails from ringing metallically.
  • If the reverb muddies the mix, raise predelay_ms or lower late_db to keep the dry signal forward.
  • Audio Convolve (IR) — reverb from a real recorded space instead of an algorithm.
  • Audio Echo — discrete echoes rather than a dense tail.
  • Audio EQ — carve space for the reverb, or de-mud it after the fact.