Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Noise Type
GV_NOISE_FUNCTIONParameter: Positive Only
GV_NOISE_POSITIVEParameter: Octaves
GV_NOISE_LEVELSParameter: Time
GV_NOISE_TIMEParameter: X Coordinate
GV_NOISE_XParameter: Y Coordinate
GV_NOISE_YParameter: Z Coordinate
GV_NOISE_ZParameter: Vector
GV_NOISE_VECTORParameter: Scale
GV_NOISE_SCALEParameter: Frequency
GV_NOISE_FREQUENCYParameter: Amplitude
GV_NOISE_AMPLITUDEParameter: Seed
GV_NOISE_SEEDParameter: Noise
GV_NOISE_OUTPUT