Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Quaternion Interpolation
ID_CKEY_QUAT_INTERParameter: Type
ID_CKEY_INTERParameter: Mute
ID_VKEY_MUTEParameter: Key Time
ID_VKEY_TIMEParameter: Key Value
ID_CKEY_VALUEParameter: Lock Time
ID_VKEY_LOCK_TParameter: Lock Value
ID_CKEY_LOCK_VParameter: Breakdown
ID_VKEY_BREAKDOWNParameter: Breakdown Color
ID_VKEY_BREAKDOWNCOLORParameter: Tangent Preset
ID_CKEY_PRESETParameter: Auto Tangents
ID_CKEY_AUTOParameter: Clamp
ID_CKEY_CLAMPParameter: Angle
ID_CKEY_AUTOMODEParameter: Remove Overshooting
ID_CKEY_REMOVEOVERSHOOTParameter: Weighted Tangent
ID_CKEY_WEIGHTEDTANGENTParameter: Automatic Weighting
ID_CKEY_AUTOWEIGHTParameter: Left Time
ID_CKEY_TIME_LEFTParameter: Right Time
ID_CKEY_TIME_RIGHTParameter: Left Value
ID_CKEY_VALUE_LEFTParameter: Right Value
ID_CKEY_VALUE_RIGHTParameter: Lock Tangent Angles
ID_CKEY_LOCK_OParameter: Lock Tangent Lengths
ID_CKEY_LOCK_LParameter: Break Tangents
ID_CKEY_BREAKParameter: Keep Visual Angle
ID_CKEY_KEEPVISUALANGLE