Support 4. channel surround sound output, support For DLS sound library technology, support for A3D 1.0 and DS3D, compatible with for DirectSound 3D and EAX sound effects. Supports For 24-bit SPDIF OUT and SPDIF IN at the same time, and also supports optical fiber input and output through daughter cards The signal-to-noise ratio of the chip reaches 120dB, PCI plug and play bus interface -full duplex playback and recording -for HRTF 3D spatial positioning sound effect, support for Dircet Sound 3D and A3D interface.