ASROCK 870 Extreme3 R2.0 Quick Installation 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 Gen3 in cable 1M.
4 4 4 4 4
ASRock
, click "Enable playback multi-streaming", and click
870 Extreme3 Motherboard