Fiio M11 - SPDIF Coaxial Output Modes; Gain Setting

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SPDIF Coaxial output:
You can choose between DOP and D2p modes. In D2P mode, DSD will Converted to PCM output.
In DOP mode, it will original output what you input (The amplifier should support DSD or there will
be noise when you play DSD in DOP mode)
Gain
Sets the gain level of the headphone output to be either High (high volume) or
Low (low volume).