Fiio M6 - Connectivity Features; USB DAC Setup and Usage

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In-line remote
Response to in-line remotes on connected headsets may be enabled or disabled by your
choice.
USB DAC
Check “USB DAC” and connect the M6 with computer via USB cable. (If you’re using
Windows system, please install the driver at https://www.fiio.com/Driver_Download; MAC system
doesn’t need to install the DAC driver.