Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Cache Location
ID_VOLUMECACHELAYER_CACHE_MODE
Parameter: Path
ID_VOLUMECACHELAYER_FILEPATH
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
Parameter: Move Cache to Internal
ID_VOLUMECACHELAYER_CONVERT_TO_INTERNAL
Parameter: Move Cache to External
ID_VOLUMECACHELAYER_CONVERT_TO_EXTERNAL