Abit SX7-533 User Manual page 21

Installing the Motherboard
(11). 6CHAUD1 Header: 6 Channels Audio Header
Note: Watch the pin position and the orientation
(12). CD1, CD2 and AUX1 Headers
You'll see this header on SX7-533 motherboard. This header
is designed to connect the CA-20 (Optional). CA-20
(Optional) can provide the analog audio output signals for
center channel, subwoofer, rear right and rear left channel. It
also provides one digital S/PDIF output connector.
Another two USB connectors on CA-20 (Optional) are
provided for use for FPIO3 or FPIO4 headers. Please refer the
description of FPIO3 and FPIO4 on item (6).
These connectors connect to the audio output of
internal CD-ROM drive or add-on card.
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User's Manual