Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Lower Hz
SOUNDPROBESUBCHANNEL_LEFTParameter: Upper Hz
SOUNDPROBESUBCHANNEL_RIGHTParameter: Max Volume
SOUNDPROBESUBCHANNEL_TOPParameter: Min Volume
SOUNDPROBESUBCHANNEL_BOTTOMParameter: Color Mode
SOUNDPROBESUBCHANNEL_COLOR_MODEParameter: Color
SOUNDPROBESUBCHANNEL_COLORParameter: Gradient
SOUNDPROBESUBCHANNEL_GRADIENTParameter: Hold
SOUNDPROBESUBCHANNEL_HOLD