Asus P4C800 Deluxe - Manual (Page 130)

5-22 Chapter 5: Software support
Rear panel audio ports function variation
The functions of the Line Out (lime), Line In (blue), and Mic (pink) ports on
the rear panel change when you select the 4-channel or 6-channel audio
configuration as shown in the following table.
Headphone/
2-Speaker
4-Speaker 6-Speaker
Light Blue Line In Line In Rear Speaker Out
Lime Line Out Front Speaker Out Front Speaker Out
Pink Mic In Rear Speaker Out Bass/Center
Windows 98SE only supports 4.1 channel speaker setting.