Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Color
CYCLONESHADER_COLORParameter: Frequency
CYCLONESHADER_FREQUENCYParameter: Rotation
CYCLONESHADER_ROTATIONParameter: Level
CYCLONESHADER_LEVEL