Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Type
SLA_DISTORTER_TYPEParameter: Wrap
SLA_DISTORTER_WRAPParameter: Amount
SLA_DISTORTER_AMOUNTParameter: X
SLA_DISTORTER_XParameter: Y
SLA_DISTORTER_YParameter: Z
SLA_DISTORTER_ZParameter: Delta
SLA_DISTORTER_DELTAParameter: Step
SLA_DISTORTER_STEPParameter: Texture
SLA_DISTORTER_TEXTUREParameter: Distorter
SLA_DISTORTER_DISTORTER