wanx-troopers

Sigmas

Intro

What the hell is a sigma schedule?!

Nodes For Working With Sigmas In Kijai’s Wrapper

WanVideo Sigma To Step if you supply a floating point value like 0.9 you can plug this into end_step input of WanVideo Scheduler and it will be treated as sigma, not step.

WanVideo Sigma To Step
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WanVideo Scheduler
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Preview Any

• WanVideo Scheduler outputs end_step as float number matching its input.
  This is likely because you can still wire that float number in WanVideo Sampler start or end step and it will work correctly - so long as scheduler is in sync between Wan Video Scheduler and WanVideo Sampler - conjecture.

• String To Float List - facility to specify sigmas directly
• Create CFG Schedule Float List - not sigma but often set in the same part of workflow.
• Preview Any - easy to way to check output from the two above mentioned nodes

Wiring two WanVideo Scheduler-s into two WanVideo Scheduler-s for Wan 2.2:

Native Nodes For Working With Sigmas

• Basic Scheduler
• Sigmas Split Value
• Custom Sampler Advanced

Other nodes you will likely see in the same workflow are

• ModelSamplingSD3 - change shift
• KSamplerSelect
• CFGGuider - split out inputs for Custom Sampler Advanced: model, positive, negative, cfg
• RandomNoise - noise input for 1st WAN 2.2 sampler
• DisableNoise - noise input for 2nd WAN 2.2 sampler

Note: model input on Basic Scheduler in Kijai’s words

just tells the scheduler that this is flow match model, so any wan model will do

E.g. one Basic Scheduler/Sigmas Split Value can drive two Custom Sampler Advanced nodes with diff models.

Can plug Dummy Comfy Wan Model Object -> WanVideo Scheduler -> WanVideo Sampler. Then Dummy Comfy Wan Model Object sets shift. One way to configure linear quadratic.

Wan 2.2 Switchover

Advice on switching from hight noise to low noise model with WAN 2.2

Model Type	Switchover Sigma
I2V	0.9
T2V	0.875

Alternative Tools

Get Sigma from BlenderNeko/ComfyUI_Noise

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