Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Animation
ID_VOLUMECACHELAYER_ANIMATION
Parameter: From
ID_VOLUMECACHELAYER_FROM
Parameter: To
ID_VOLUMECACHELAYER_TO
Parameter: Cache
ID_VOLUMECACHELAYER_BUTTON_CACHE
Parameter: Refresh
ID_VOLUMECACHELAYER_BUTTON_REFRESH
Parameter: Clear
ID_VOLUMECACHELAYER_BUTTON_CLEAR