2.
Under Audio MIDI Setup, open Audio Devices, and make sure to choose USB Sound
Device under System Settings and Properties For. Also please check that the Audio
Output setting's Format is set to: 8ch-16bit.
After the above settings, please select Configure Speakers to follow to the next step.
3.
Select Multichannel then chose 7.1 Rear Surround, and now the setting has finished.
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