Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Scale
PAVEMENT_SCALEParameter: Seed
PAVEMENT_SEEDParameter: Width
PAVEMENT_GAP_SIZEParameter: Soft
PAVEMENT_GAP_BLURParameter: Crookedness
PAVEMENT_GAP_CROOKED_INTENSITYParameter: Crookedness Scale
PAVEMENT_GAP_CROOKED_SCALEParameter: Stone Color
PAVEMENT_COL_STONEParameter: Rough Structure
PAVEMENT_COL_STONE_STRUCT1Parameter: Fine Structure
PAVEMENT_COL_STONE_STRUCT2Parameter: Gap Color
PAVEMENT_COL_GAPParameter: Grainy Gaps
PAVEMENT_COL_GRAINYGAPSParameter: Contrast Grain
PAVEMENT_COL_GRAINYGAPS_MODEParameter: Smudgy Color
PAVEMENT_COL_SMUDGEParameter: Smudgy Edges
PAVEMENT_COL_SMUDGYEDGESParameter: Smudgy Edges Size
PAVEMENT_COL_SMUDGYEDGES_SIZE