REQUIRED OVERRIDES: These overrides are required from ISoundfieldFactory: ISoundfieldFactory::CreateNewEncoderStream ISoundfieldFactory::CreateNewTranscoderStream ISoundfieldFactory::CreateNewMixerStream ISoundfieldFactory::CreateEmptyPacketISoundfieldFactory::CanTranscodeFromSoundfieldFormatISoundfieldFactory::GetCustomEncodingSettingsClass ISoundfieldFactory::GetDefaultEncodingSettingsCalled for every new endpoint submix created with this factory's endpoint type.