> ## Documentation Index > Fetch the complete documentation index at: https://comfytv.org/llms.txt > Use this file to discover all available pages before exploring further. # Audio Repair > Fix specific audio defects — clicks and pops, clipped/distorted peaks, denormals, and mains-frequency hum — with targeted restoration filters. Audio Repair ## What this node does **Audio Repair** applies one restoration processor to an audio track, chosen by **method**: * **declick** — removes impulsive clicks and pops (FFmpeg `adeclick`), e.g. vinyl crackle or edit ticks. * **declip** — reconstructs clipped/flat-topped peaks from distorted, over-loud recordings (FFmpeg `adeclip`). * **denorm** — remedies denormal-number issues (FFmpeg `adenorm`) that can cause CPU spikes or subtle artifacts in very quiet passages. * **wavelet** — wavelet-domain denoiser (FFmpeg `afwtdn`) for broadband noise, with fine control over strength and detail. * **hum** — removes mains hum by notching out a fundamental frequency and its harmonics (a stack of FFmpeg `bandreject` filters). 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](https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md). ## When to use it * Clean crackle and pops off a digitized vinyl or old tape (**declick**). * Rescue a recording that was tracked too hot and is clipping (**declip**). * Notch out a 50 Hz or 60 Hz electrical buzz and its harmonics (**hum**). * Apply a controlled, high-quality denoise pass when broadband methods sound too soft (**wavelet**). ## Parameters ### method Which processor to run: `declick` (default), `declip`, `denorm`, `wavelet`, or `hum`. The parameters below are grouped by the method they belong to. ### declick parameters (`dk_*`) * **dk\_window** — detection window size. Range **10–100**, default **55**. * **dk\_threshold** — click-detection sensitivity. Range **1–100**, default **2**. Lower catches more (and risks false positives). * **dk\_burst** — how aggressively bursts of clicks are treated. Range **0–10**, default **2**. ### declip parameters (`dc_*`) * **dc\_threshold** — clip-detection threshold. Range **1–100**, default **10**. * **dc\_hsize** — reconstruction window (history size). Range **100–9999**, default **1000**. ### denorm parameter (`dn_*`) * **dn\_level** — denormal treatment level in dB. Range **-451 to -90**, default **-351**. ### wavelet parameters (`wt_*`) * **wt\_sigma** — noise strength. Range **0–1**, default **0**. **Must be greater than 0** — the node raises an error if you leave it at 0 in wavelet mode. * **wt\_percent** — how much of the detected noise to remove, as a percentage. Range **0–100**, default **85**. * **wt\_levels** — number of wavelet decomposition levels. Range **1–12**, default **10**. ### hum parameters (`hum_*`) * **hum\_freq** — fundamental hum frequency in Hz (e.g. 50 or 60 for mains). Range **10–2000**, default **50**. * **hum\_harmonics** — how many harmonics of the fundamental to notch out. Range **1–16**, default **8**. Harmonics that would exceed the Nyquist limit are skipped. * **hum\_q** — notch width (Q) for the reject filters. Range **1–100**, default **8**. The Q widens progressively for higher harmonics. ## Outputs | Output | Type | Meaning | | ------------ | ---------------- | ------------------------------------------------- | | **audio** | `COMFYTV_AUDIO` | The repaired audio snapshot | | **fx\_spec** | `COMFYTV_FXSPEC` | The step as a spec, for chaining into an FX Chain | ## Tips * **Wavelet needs `wt_sigma` > 0**, otherwise the node errors — it won't silently do nothing. * Match **hum\_freq** to your local mains: **50** Hz in most of the world, **60** Hz in North America and parts of Asia. * `declip` reconstructs waveform; it can't recover detail that was truly lost to hard clipping, but it removes the harsh buzz. ## Related nodes * **Audio Denoise** — broadband hiss/hum reduction and silence trimming (`afftdn` / `anlmdn` / `silenceremove`). * **Audio EQ** — a peak cut is an alternative way to attack a single resonant frequency. * **FX Chain** — renders multiple `fx_spec` steps (including this one) in a single pass.