This is an ESS Maestro-2 PCI audio accelerator with dual-audio engine. It features proprietary WaveCache technology to speed up PCI bus cycle during playback or recording and build-in synthesizer that performs advanced audio effects - reverb, chorus, tremble, bass, flange, echo and 3-D spatial enhancement. It supports 2MB/4MB wavetable sound sets, DLS (downloadable samples) 64-voice wavetable synthesizer, HRTF 3-D and CRL-3D (Support Game with A3D mode), DirectSound and DirectSound 3D, AC3 speaker virtualization High quality signal-to-noise ratio: over 85 dB ADPCM data compression.