Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Color
TURBULENCESHADER_COLOR
Parameter: U Frequency
TURBULENCESHADER_SCALEX
Parameter: V Frequency
TURBULENCESHADER_SCALEY
Parameter: Octaves
TURBULENCESHADER_OCTAVES