MSI X58 PRO MS-7522 User Manual page 92

 6-Channel M ode for 6-Speaker Output
1 Line In
2 Line Out (Front channels) F F r r r on ron r r on on t t c c
3 MIC
4 Line Out (Rear channels)
5 Line Out (Center and Subwoofer channel)
6 No function
1
2
3
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Realtek Audio
4
5
6
A-21