Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Animation
ID_CTRACK_ANIMOFF
Parameter: Solo Animation
ID_CTRACK_ANIMSOLO
Parameter: Constant Velocity
ID_CTRACK_CONSTANTVELOCITY_V
Parameter: Before
ID_CTRACK_BEFORE
Parameter: Repetitions
ID_CTRACK_BEFORE_CNT
Parameter: After
ID_CTRACK_AFTER
Parameter: Repetitions
ID_CTRACK_AFTER_CNT
Parameter: Loop End
ID_CTRACK_TIME_LOOP_END
Parameter: Time Track
ID_CTRACK_TIME
Parameter: Relative Mapping
ID_CTRACK_TIME_RELATIVE
Parameter: Color from Preferences
ID_CTRACK_USE_PREF
Parameter: Color
ID_CTRACK_FCURVE_COLOR
Parameter: F-Curve Offset
ID_CTRACK_FCURVE_OFFSET
Parameter: F-Curve Scale
ID_CTRACK_FCURVE_SCALE
Parameter: R23 Evaluation
ID_CTRACK_EVALUATION_MODE