MIXER_MULTI_FUNCTION
iRtnDataSz = sizeof( MIXER_MULTI_FUNCTION ) - sizeof( MIXER_FUNCTION );
#define ComputeMixerMultiFunctionSize(Ct) ( sizeof( MIXER_MULTI_FUNCTION ) + ( sizeof( MIXER_FUNCTION ) * ( Ct - 1 ) ) )
MIXER_MULTI_FUNCTION multi_function[2];
MIXER_MULTI_FUNCTION multi_function[2];