Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Mode
FP_SPLINEEMITTER_SPLINE_MODEParameter: Restriction
FP_SPLINEEMITTER_SPLINE_RESTRICTIONParameter: Restriction Threshold
FP_SPLINEEMITTER_SPLINE_RESTRICTION_THRESHOLDParameter: Scatter
FP_SPLINEEMITTER_SPLINE_SCATTERParameter: Interval
FP_SPLINEEMITTER_SPLINE_INTERVALParameter: Thickness
FP_SPLINEEMITTER_SPLINE_OFFSETParameter: Thickness Variance
FP_SPLINEEMITTER_SPLINE_OFFSET_VARIANCEParameter: Born
FP_SPLINEEMITTER_OUTPUT_BORNParameter: FP_SPLINEEMITTER_OUTPUT_BORN_ATTRIBUTE_NAME
FP_SPLINEEMITTER_OUTPUT_BORN_ATTRIBUTE_NAMEParameter: Create
FP_SPLINEEMITTER_OUTPUT_BORN_ATTRIBUTE_CREATEParameter: T Value
FP_SPLINEEMITTER_OUTPUT_TVALUEParameter: FP_SPLINEEMITTER_OUTPUT_TVALUE_ATTRIBUTE_NAME
FP_SPLINEEMITTER_OUTPUT_TVALUE_ATTRIBUTE_NAMEParameter: Create
FP_SPLINEEMITTER_OUTPUT_TVALUE_ATTRIBUTE_CREATEParameter: Segment T Value
FP_SPLINEEMITTER_OUTPUT_SEGMENTTVALUEParameter: FP_SPLINEEMITTER_OUTPUT_SEGMENTTVALUE_ATTRIBUTE_NAME
FP_SPLINEEMITTER_OUTPUT_SEGMENTTVALUE_ATTRIBUTE_NAMEParameter: Create
FP_SPLINEEMITTER_OUTPUT_SEGMENTTVALUE_ATTRIBUTE_CREATEParameter: Segment Index
FP_SPLINEEMITTER_OUTPUT_SEGMENTINDEXParameter: FP_SPLINEEMITTER_OUTPUT_SEGMENTINDEX_ATTRIBUTE_NAME
FP_SPLINEEMITTER_OUTPUT_SEGMENTINDEX_ATTRIBUTE_NAMEParameter: Create
FP_SPLINEEMITTER_OUTPUT_SEGMENTINDEX_ATTRIBUTE_CREATE