Gigabyte 6VXDC7 User Manual page 51

Four Speaker & SPDIF Introduction
c. Two speaker (Default)
d. Click "Four speaker" item.
C. Four Speaker Application
The four speaker function will only support in application software that use Microsoft DirectX
and Creative EAX. For example, the game titles, software DVD player and MP3 player. Those
software support Microsoft DirectX, so they can support four speaker output.
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