Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Random Seed
OP_MATTERWAVES_SEEDParameter: Object
OP_MATTERWAVES_OBJECTParameter: Selection
OP_MATTERWAVES_SELECTIONParameter: UVW
OP_MATTERWAVES_UVWParameter: UVW Type
OP_MATTERWAVES_UVWTYPEParameter: Lights
OP_MATTERWAVES_LIGHTLISTParameter: Birth Type
OP_MATTERWAVES_BTYPEParameter: Count
OP_MATTERWAVES_COUNTParameter: Rate
OP_MATTERWAVES_RATEParameter: Shot
OP_MATTERWAVES_SHOTParameter: Birth Type
OP_MATTERWAVES_BIRTHTYPEParameter: Birth Texture
OP_MATTERWAVES_BIRTHTEXParameter: Birth Gradient
OP_MATTERWAVES_BIRTHGRADParameter: Life
OP_MATTERWAVES_LIFEParameter: Life Variation
OP_MATTERWAVES_LIFEVARParameter: Life Type
OP_MATTERWAVES_LIFETYPEParameter: Life Texture
OP_MATTERWAVES_LIFETEXParameter: Life Gradient
OP_MATTERWAVES_LIFEGRADParameter: Speed
OP_MATTERWAVES_SPEEDParameter: Speed Variation
OP_MATTERWAVES_SPEEDVARParameter: Speed Type
OP_MATTERWAVES_SPEEDTYPEParameter: Speed Texture
OP_MATTERWAVES_SPEEDTEXParameter: Speed Gradient
OP_MATTERWAVES_SPEEDGRADParameter: Size
OP_MATTERWAVES_SIZEParameter: Size Variation
OP_MATTERWAVES_SIZEVARParameter: Size Type
OP_MATTERWAVES_SIZETYPEParameter: Size Texture
OP_MATTERWAVES_SIZETEXParameter: Size Gradient
OP_MATTERWAVES_SIZEGRADParameter: Distance
OP_MATTERWAVES_DISTANCEParameter: Distance Variation
OP_MATTERWAVES_DISTVARParameter: Distance Type
OP_MATTERWAVES_DISTTYPEParameter: Distance Texture
OP_MATTERWAVES_DISTTEXParameter: Distance Gradient
OP_MATTERWAVES_DISTGRADParameter: Direction
OP_MATTERWAVES_DIRINTENSParameter: Direction Variation
OP_MATTERWAVES_DIRVARParameter: Direction Type
OP_MATTERWAVES_DIRTYPEParameter: Direction Texture
OP_MATTERWAVES_DIRTEXParameter: Direction Gradient
OP_MATTERWAVES_DIRGRADParameter: On
OP_MATTERWAVES_IN_ONParameter: Animation Time
OP_MATTERWAVES_IN_ATIMEParameter: Birth Count
OP_MATTERWAVES_OUT_PARTICLECOUNTParameter: Birth Num
OP_MATTERWAVES_OUT_PARTICLENUMParameter: Birth UVW
OP_MATTERWAVES_OUT_UVW