Skip to main content
Audio Reactive

Audio Reactive · screenshot coming soon

​
What this node does

Audio Reactive tracks the loudness envelope of a chosen frequency band (bass, mid, high, full, or a custom range) across the whole track and converts it into a stream of animation keyframes. As the bass thumps, the mapped field rises and falls with it. Unlike Audio Beats & Notes (which fires on discrete events), this produces a smooth, continuous curve you can attack/release-shape and remap to any range. It accepts a COMFYTV_AUDIO snapshot or a COMFYTV_VIDEO (its audio track is used; audio takes priority). It outputs COMFYTV_TEXT keyframes and has a ▶ Run. To feed native ComfyUI AUDIO in or out, insert a Bridge — see bridges.md.

​
When to use it

  • Make an object’s scale breathe with the bass of a music track.
  • Drive opacity, position, or rotation from the overall energy of a mix.
  • Create continuous audio-driven motion rather than beat-by-beat pulses.

​
Parameters

​
band

Which frequency range to follow: bass (default, 20–160 Hz), mid (160–2000 Hz), high (2000–8000 Hz), full (20–16000 Hz), or custom (use freq_lo/freq_hi).

​
freq_lo / freq_hi

Custom band edges in Hz, used only when band is custom. freq_lo range 10 to 16000, default 40; freq_hi range 20 to 16000, default 200.

​
attack

How quickly the envelope rises when energy increases, in seconds. Range 0.001 to 1.0, default 0.02. Short = snappy response to transients.

​
release

How quickly the envelope falls when energy drops, in seconds. Range 0.01 to 2.0, default 0.25. Longer = smoother, more sustained motion.

​
rate

Keyframes generated per second (temporal resolution of the curve). Range 1 to 60, default 10. Match it to your output frame rate for smooth motion.

​
min_value / max_value

The output range the envelope is remapped into: quietest maps to min_value, loudest to max_value. Both range -1000 to 1000; defaults 0 and 1. Swap them to invert the response.

​
gain

Multiplier applied to the envelope before remapping. Range 0.1 to 8, default 1.0. Raise it to make a quiet track drive the full range.

​
field

Which animation field the keyframes drive: v (default), scale, opacity, x, y, or rotation.

​
Outputs

​
Tips

  • Lower attack for punchy, transient-following motion; raise release to avoid jittery flicker.
  • If a quiet mix barely moves the field, raise gain or narrow min/max — or pick a busier band.
  • Set rate to your project’s fps so keyframes land on frames.
  • Audio Beats & Notes — discrete beat/onset events instead of a continuous envelope.
  • Audio Meter Overlay — burn a live level meter onto a video for reference.