The OPTi931 is a highly integrated single chip designed solution utilizing the latest technology for high quality PC sound, with built-in high quality 22 voice, 52 operators, OPTiFM music synthesizer together with the 16-bit sigma-delta codec, which delivers a true 16-bit FM Stereo sound with Plug 'n' Play and Full Duplex features. It is also available in two versions, with or without on-board 3D sound effect.
Digital Audio Features:
| Recording & Playback | Simultaneous 16-bit stereo A/D and D/A |
| Sampling Rate | 235 sample rates from 4KHz to 48 KHz |
| Data Compression | IMA ADPCM, u-law, A-law decompression |
| Integrated Codec | 16-bit sigma-delta stereo codec Full Duplex operation |
| OPTiFM Synthesizer | 22 voices / 52 operators |
| Volume Control | Software control via push button interface |
| Wavetable | Universal upgrade port |
| 3D Sound Effect | Optional hardware add-on circuitry |
| Output Power Amp: | 2 watts per channel |
| Audio Mixer: | 7-channel mixer-5 stereo, 2 mono |
| Compatibility: | Sound Blaster, Sound Blaster Pro, Window Sound System, Window 95's Direct Sound, MPC, MPCII, AdLib |
| Card Configuration: | Plug 'n" Play under win 95, Software programmable under DOS and Win 3.x |
| CDROM Interface: | ATAPI IDE Interface |
| MIDI Interface: | MPU401 supports DUAL game ports for joysticks or external MIDI |
| Audio Utilities: | WILLOW POND Sound System include: Media Launcher, Presto Arranger MIDI Sequencer, Media Rack, Wave Editor and WinChime |
| Advanced Power Management: | Power-down modes Silence mode to turn-off all audio functions |