Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Top
ID_CA_SQUASH_OBJECT_HIGH
Parameter: Center
ID_CA_SQUASH_OBJECT_CENTER
Parameter: Bottom
ID_CA_SQUASH_OBJECT_LOW
Parameter: Aspect
ID_CA_SQUASH_OBJECT_ASPECT
Parameter: Factor
ID_CA_SQUASH_OBJECT_FACTOR
Parameter: Expand
ID_CA_SQUASH_OBJECT_STRENGTH
Parameter: Smooth Start
ID_CA_SQUASH_OBJECT_SMOOTH_START
Parameter: Smooth End
ID_CA_SQUASH_OBJECT_SMOOTH_END
Parameter: Curvature
ID_CA_SQUASH_OBJECT_CURVATURE
Parameter: Type
ID_CA_SQUASH_OBJECT_CURVATURE_TYPE
Parameter: Power
ID_CA_SQUASH_OBJECT_CURVATURE_CUSTOM
Parameter: Curve
ID_CA_SQUASH_OBJECT_CURVATURE_SPLINE
Parameter: Fit to Parent
ID_CA_SQUASH_OBJECT_FITTOPARENT