SonarAdvancedPyramidNoise

If you've ever seen a workflow boast about "highres pyramid noise" as the secret ingredient, this is the node behind it. Pyramid (multi-resolution) noise builds up a noise field one octave at a time - generate coarse noise, upsample it, add the next finer layer, repeat - so you get structure at every scale instead of flat white static. Blepping's implementation is based on Jonathan Whitaker's multi-resolution noise write-up, which is a well-known resource in the noise-nerd corner of the community.

That coarse-to-fine structure is exactly why pyramid noise became the high-resolution fix crowd's favorite. During a second-pass upsample, you want the sampler to fill in detail without re-rolling the whole composition; a noise that already has structure across scales gives it a better starting skeleton than gaussian static does. People reach for the highres_pyramid variant specifically for this. It's a "reasonably well-known good idea" node rather than a pure curiosity - the noise_type dropdowns elsewhere in the pack (like SamplerConfigOverride) even list highres_pyramid as a built-in option.

Inputs worth knowing:

• variant - highres_pyramid (the one people actually use), pyramid, and pyramid_old. Different flavor, same family.
• iterations - number of octaves, -1 for the variant default. More octaves = more fine detail = slower.
• discount - how much each successive octave's amplitude is scaled down, 0 for the variant default. This is the lever that controls how far the fine detail reaches.
• upscale_mode - how each octave is resized to the next level: bilinear, bicubic, nearest, area, bislerp, adaptive_avg_pool2d, or default. This changes the character of the detail noticeably.
• factor / rescale - the pack-wide strength controls.

Output is SONAR_CUSTOM_NOISE, chainable via sonar_custom_noise_opt, and consumed by any custom noise input. The standard one-liner installs it with no model files:

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

Two things to get right. First, as with all the noise-injection nodes, it shows up on samplers that actually add noise - ancestral, SDE, or the sonar momentum samplers. Second, if you're using it in the high-res-fix sense, it's the initial latent that matters: it works well as your second-pass starting noise at moderate-to-low denoise, where gaussian would otherwise fight the existing image structure. Start with highres_pyramid, leave iterations and discount on defaults, and only touch upscale_mode once you've seen the base effect. It's the one "advanced noise" node in this pack with a genuinely mainstream use, and it earns the hype it gets in those workflow descriptions.