Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Filename
ID_VOLUMESEQUENCE_PATHParameter: Reload
ID_VOLUMESEQUENCE_RELOADParameter: Use Animation
ID_VOLUMESEQUENCE_ANIMATION_ACTIVEParameter: Frame
ID_VOLUMESEQUENCE_FRAMEParameter: Map Name To Frame
ID_VOLUMESEQUENCE_FIXEDCACHEParameter: From
ID_VOLUMESEQUENCE_FROMParameter: To
ID_VOLUMESEQUENCE_TOParameter: Offset
ID_VOLUMESEQUENCE_OFFSETParameter: Loop
ID_VOLUMESEQUENCE_LOOPParameter: Speed
ID_VOLUMESEQUENCE_SCALEParameter: Cache Memory Limit (gb)
ID_VOLUMESEQUENCE_MAXMEMORY