Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Filename
ID_VOLUMESEQUENCE_PATH
Parameter: Reload
ID_VOLUMESEQUENCE_RELOAD
Parameter: Use Animation
ID_VOLUMESEQUENCE_ANIMATION_ACTIVE
Parameter: Frame
ID_VOLUMESEQUENCE_FRAME
Parameter: Map Name To Frame
ID_VOLUMESEQUENCE_FIXEDCACHE
Parameter: From
ID_VOLUMESEQUENCE_FROM
Parameter: To
ID_VOLUMESEQUENCE_TO
Parameter: Offset
ID_VOLUMESEQUENCE_OFFSET
Parameter: Loop
ID_VOLUMESEQUENCE_LOOP
Parameter: Speed
ID_VOLUMESEQUENCE_SCALE
Parameter: Cache Memory Limit (gb)
ID_VOLUMESEQUENCE_MAXMEMORY