Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Sound File
MGSOUNDEFFECTOR_FILEParameter: Start Offset
MGSOUNDEFFECTOR_STARTParameter: Apply Mode
MGSOUNDEFFECTOR_MGMODEParameter: Falloff
MGSOUNDEFFECTOR_FALLOFFParameter: Sample Mode
MGSOUNDEFFECTOR_MODEParameter: Clamp Output
MGSOUNDEFFECTOR_CLAMPParameter: Lower Cutoff
MGSOUNDEFFECTOR_LOWERLIMITParameter: Compression
MGSOUNDEFFECTOR_MULTIPLIERParameter: Frequency Graph
MGSOUNDEFFECTOR_GRAPHParameter: Filter Shape
MGSOUNDEFFECTOR_FILTERSHAPEParameter: Frequency Color
MGSOUNDEFFECTOR_COLORGRADIENTParameter: Frequency
MGSOUNDEFFECTOR_FREQParameter: Bandwidth
MGSOUNDEFFECTOR_BANDWIDTHParameter: Left Channel
MGSOUNDEFFECTOR_LCHANNELParameter: Right Channel
MGSOUNDEFFECTOR_RCHANNELParameter: Use Filter
MGSOUNDEFFECTOR_FILTERParameter: Play
MGSOUNDEFFECTOR_PLAYParameter: Scrub Sound
MGSOUNDEFFECTOR_SCRUB