Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Amplitude
WINDDEFORMOBJECT_AMPLITUDEParameter: Size
WINDDEFORMOBJECT_SIZEParameter: Frequency
WINDDEFORMOBJECT_FREQUENCYParameter: Turbulence
WINDDEFORMOBJECT_TURBULENCEParameter: fx
WINDDEFORMOBJECT_FXParameter: fy
WINDDEFORMOBJECT_FYParameter: Flag
WINDDEFORMOBJECT_FLAG