Fiio M7 - USB DAC Functionality

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3. In-line remote:
Response to in-line remotes on connected headsets may be enabled or disabled by your choice.
4. USB DAC:
Check “USB DAC” and connect the M7 with computer via USB cable. (If you’re using Windows
system, please install the driver at https://www.fiio.com/supports; MAC system doesn’t need to
install the DAC driver.
(If there is no USB DAC option appearing on your M7, please update the M7 to FW1.0.4 or above
firstly.)