Feedback FX

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What this node does

Feedback FX blends each frame with a transformed version of the previous output, the way a camera pointed at its own monitor creates infinite tunnels. Depending on mode you get a spiraling vertigo zoom, layered echo trails, or a jittery “nervous” stutter. It writes a new COMFYTV_VIDEO snapshot on ▶ Run. In and out are both COMFYTV_VIDEO. To feed native ComfyUI nodes, insert a Bridge — see the bridge guide.

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When to use it

• Create psychedelic tunnels and infinite-zoom vertigo visuals.
• Leave motion echo/ghost trails behind moving subjects.
• Add a nervous, glitchy stutter to a clip for tension.

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Parameters

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mode

The feedback behavior. Options: vertigo (zoom/rotate spiral), echo (layered motion trails), nervous (jittery stutter). Default vertigo.

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phase_increment

Rotation/phase advance per frame, 0.0–1.0 (step 0.005), default 0.08. Higher spins or shifts the feedback faster.

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zoom

Per-frame zoom of the fed-back layer, -0.5–0.5 (step 0.005), default 0.06. Positive zooms in (tunnel inward), negative zooms out.

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feedback_mix

How much of the previous output survives into the next frame, 0.0–0.98 (step 0.01), default 0.75. Higher = longer-lasting, deeper trails; near 0.98 the feedback almost never fades.

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style

Sub-style for the nervous mode. Options: shuffle or scratch. Default shuffle. (Only affects nervous.)

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frames

Frame window used to build the effect, 2–32, default 32. Larger uses more history.

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seed

Random seed, 0–99999, default 7. Same seed = repeatable jitter (mainly for nervous).

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Outputs

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Tips

• Keep feedback_mix high for long, painterly trails; lower it if the image saturates or smears into mush.
• style and seed mainly matter in nervous mode.
• Small zoom + steady phase_increment gives a smooth infinite-tunnel; larger values get chaotic fast.

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Related nodes

• Light Graffiti — trails built from bright pixels rather than full-frame feedback.
• Slit Scan — time-smear across rows/columns.