Change the amount of Denoising node in Composition

I am learning to use the denoising node in composition.
But there seems no slide to control the amount of denoise that i need?
Any way to achieve it?

Mix it with the original render with a mix node.

Thanks. Seems to be a solution, will it decrease the quality of the render?

Well, depends on what you mean.
By decreasing quality through allowing more noise, then yes, because you wanted to alter how much denoising is applied to the render. That is if by “poor quality” you mean more noise.
The example I show essentially mixes 100% denoised image with a 0% denoised image. The factor alters how much of each.

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Got it, thanks!