SonarPowerFilterNoise

SonarPowerFilterNoise is the application node in the pack's power-noise family: it takes a SONAR_POWER_FILTER (built with SonarPowerFilter), applies it to a SONAR_CUSTOM_NOISE chain, and gives you a mix control so you can blend filtered and raw noise. This is the node you reach for when you've designed a frequency filter and want to hear it against your actual noise.

What it does

Frequency filtering is the tool for "this noise has the wrong texture." Soft blurry starting noise when you want fine detail? Boost high frequencies. Grain that's too nervous? Cut high frequencies and let the low, smooth structure through. The power-filter system makes that repeatable: build the filter once, reuse it across Gaussian, pyramid, colored - any noise in the pack.

The inputs that matter

• sonar_power_filter - the filter object from SonarPowerFilter. The whole point.
• sonar_custom_noise - the noise being filtered. Any SONAR_CUSTOM_NOISE chain works.
• mix - the blend ratio, default 1. 0.75 means 75% filtered noise + 25% raw. This is the knob that keeps you from overshooting: full filter is often too strong, and dialing mix down preserves some of the original noise character.
• filter_norm_factor - normalization applied to the filter, 1.0 = fully normalized. Leave at 1 unless the filter feels too aggressive.
• common_mode - a desaturation helper: injects the average across channels to pull the latent away from colored-noise rainbow artifacts. 0 is off; push it up to neutralize channel bias.
• channel_correlation - comma-separated strengths per channel (default "1, 1, 1, 1, 1, 1"). Lowering a channel's value decorrelates it from its neighbors.

Then the standard trio: normalize_noise, normalize_result, plus factor and rescale for chain scaling.

The killer feature: preview

preview is where this node pays for itself. none off; no_mix shows only the filtered noise; mix shows noise after the mix; custom shows a color preview of the noise using a latent previewer (the tooltip recommends TAESD). You can iterate on your filter visually instead of blind-sampling and hoping. That's a genuinely rare thing in noise tooling and the reason to prefer this node over the all-in-one SonarPowerNoise when you're tuning.

How it fits

The intended pipeline is SonarPowerFilter → SonarPowerFilterNoise, with SonarCustomNoise feeding the noise input. Output is SONAR_CUSTOM_NOISE, so the filtered result chains into composites, samplers, or further filtering. The README's docs/advanced_power_noise.md has the worked examples.

Install

ComfyUI Manager → search "ComfyUI-sonar" → Install → restart, or:

cd ComfyUI/custom_nodes
git clone https://github.com/blepping/ComfyUI-sonar

No models, no pip deps. As with the whole pack, the README flags that the noise types are best-effort implementations and that seeds can differ between GPU models because noise generation isn't pinned to a device. For power-noise work specifically, the author also warns some filter math may be "janky" - if a filter produces nonsense, try a simpler shape before blaming your settings.