Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Texture
SLA_FILTER_TEXTURE
Parameter: Hue
SLA_FILTER_HUE
Parameter: Saturation
SLA_FILTER_SATURATION
Parameter: Lightness
SLA_FILTER_LIGHTNESS
Parameter: Colorize
SLA_FILTER_COLORIZE
Parameter: Brightness
SLA_FILTER_BRIGHNESS
Parameter: Contrast
SLA_FILTER_CONTRAST
Parameter: Gamma
SLA_FILTER_GAMMA
Parameter: Enable Clipping
SLA_FILTER_CLIPPING
Parameter: Low Clip
SLA_FILTER_LOW_CLIP
Parameter: High Clip
SLA_FILTER_HIGH_CLIP
Parameter: Enabled
SLA_FILTER_GRADING_ENABLED
Parameter: Intensity
SLA_FILTER_GRADING_INTENSITY
Parameter: RGB
SLA_FILTER_GRADING_CURVE_RGB
Parameter: R
SLA_FILTER_GRADING_CURVE_R
Parameter: G
SLA_FILTER_GRADING_CURVE_G
Parameter: B
SLA_FILTER_GRADING_CURVE_B