ASROCK X58 Extreme6 Manual page 4

To enable Multi-Streaming function, you need to connect a front panel audio cable to the front
panel audio header. After restarting your computer, you will find "Mixer" tool on your system.
Please select "Mixer ToolBox"
"ok". Choose "2CH", "4CH", "6CH", or "8CH" and then you are allowed to select "Realtek HDA
Primary output" to use Rear Speaker, Central/Bass, and Front Speaker, or select "Realtek
HDA Audio 2nd output" to use front panel audio.
*** eSATA3 connector supports SATA 6Gb/s in cable 1M, supports SATA 3Gb/s in cable 2M.
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, click "Enable playback multi-streaming", and click
ASRock X58 Extreme6 Motherboard