SetFirstSigma - ComfyUI Built-in Node Documentation - ComfyUI

The SetFirstSigma node changes a sigma sequence by replacing only its first value with a custom sigma value. It takes an existing sigma sequence and a new sigma value, then returns a new sigma sequence where all values except the first remain unchanged.

Inputs

Parameter	Description	Data Type	Required	Range
`sigmas`	The input sequence of sigma values to be modified	SIGMAS	Yes	-
`sigma`	The new sigma value to set as the first element in the sequence (default: 136.0)	FLOAT	Yes	0.0 to 20000.0

Outputs

Output Name	Description	Data Type
`sigmas`	The modified sigma sequence with the first element replaced by the custom sigma value	SIGMAS

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