AOpen AW540 Series - Manual (Page 6)

Features
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FM Synthesizer
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Hardware Sound Blaster Pro compatibility
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Supports Consumer IEC958 Output (S/PDIF OUT) (excluded AW540-L)
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Supports Consumer IEC958 Input (CD Digital IN) (excluded AW540-L)
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Supports External Optical/Coaxial S/PDIF IN Connector(For AW540 DELUXE only)
Software-controllable audio
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Supports various audio devices all controllable through software
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Adjusts master volume, CD audio, line-in, and microphone inputs
3D Surround Enhancement
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Adjusts AC97 CODEC to enhance 3D Surround effect
Driver Support
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Microsoft Windows 95/98/Me VXD driver
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Microsoft Windows NT 4.0
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Microsoft Windows 2000 driver
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MS-DOS