Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Wave length
SLA_WAVE_PARAMS_LENGTHParameter: Speed
SLA_WAVE_PARAMS_SPEEDParameter: Amplitude
SLA_WAVE_AMPLITUDEParameter: Falloff
SLA_WAVE_FALLOFFParameter: Minimal Strength
SLA_WAVE_PARAMS_MIN_STRENGTHParameter: Periods
SLA_WAVE_PERIODSParameter: Particle Dependent
SLA_WAVE_PARAMS_SPEED_PARTICLE_DEPENDENTParameter: Object
SLA_WAVE_PARAMS_OBJECTParameter: Particles
SLA_WAVE_PARTICLE