help please

[lsd4me2]

"If you just want to turn a section into gray scale simply use Tweak with Saturation 0 and user 'ApplyOnlyTo' with your section. " that would e the simplest solution and i tried to do it that way. Under vaporsynth/Misc/UI i checked the option for show "apply only to" controls, but under the Color/basic tab where tweak is there is stil nothing there to set the range. Also if i did it that way i would lose my settings for the color parts, no?